ADVERSE REACTIONS SECTION.

6 ADVERSE REACTIONS Most common adverse reactions (greater than or equal to 3%) are abdominal pain, acid regurgitation, constipation, diarrhea, dyspepsia, musculoskeletal pain, nausea. 6.1) To report SUSPECTED ADVERSE REACTIONS, contact FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.. 6.1 Clinical Trials Experience. Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.Treatment of Osteoporosis in Postmenopausal WomenDaily DosingThe safety of alendronate sodium in the treatment of postmenopausal osteoporosis was assessed in four clinical trials that enrolled 7453 women aged 44 to 84 years. Study and Study were identically designed, three-year, placebo-controlled, double-blind, multicenter studies (United States and Multinational n=994); Study was the three-year vertebral fracture cohort of the Fracture Intervention Trial [FIT] (n=2027) and Study was the four-year clinical fracture cohort of FIT (n=4432). Overall, 3620 patients were exposed to placebo and 3432 patients exposed to alendronate sodium. Patients with pre-existing gastrointestinal disease and concomitant use of non-steroidal anti-inflammatory drugs were included in these clinical trials. In Study and Study all women received 500 mg elemental calcium as carbonate. In Study and Study all women with dietary calcium intake less than 1000 mg per day received 500 mg calcium and 250 international units Vitamin per day.Among patients treated with alendronate 10 mg or placebo in Study and Study 2, and all patients in Study and Study 4, the incidence of all-cause mortality was 1.8% in the placebo group and 1.8% in the alendronate sodium group. The incidence of serious adverse event was 30.7% in the placebo group and 30.9% in the alendronate sodium group. The percentage of patients who discontinued the study due to any clinical adverse event was 9.5% in the placebo group and 8.9% in the alendronate sodium group. Adverse reactions from these studies considered by the investigators as possibly, probably, or definitely drug related in greater than or equal to 1% of patients treated with either alendronate sodium or placebo are presented in Table 1.Table 1: Osteoporosis Treatment Studies in Postmenopausal Women Adverse Reactions Considered Possibly, Probably, or Definitely Drug Related by the Investigators and Reported in Greater Than or Equal to 1% of PatientUnited States/ Multinational StudiesFracture Intervention TrialAlendronate Sodium% (n=196)Placebo% (n=397)Alendronate Sodium% (n=3236)Placebo% (n=3223)Gastrointestinalabdominal pain6.64.81.51.5nausea3.641.11.5dyspepsia3.63.51.11.2constipation3.11.800.2diarrhea3.11.80.60.3flatulence2.60.50.20.3acid regurgitation24.31.10.9esophageal ulcer1.500.10.1vomiting11.50.20.3dysphagia100.10.1abdominal distention10.800gastritis0.51.30.60.7Musculoskeletalmusculoskeletal (bone, muscle or joint) pain4.10.40.3muscle cramp00.20.1Nervous System/Psychiatricheadache2.60.20.2dizziness000.1Special Sensetaste perversion0.50.1010 mg/day for three years5 mg/day for years and 10 mg/day for either or additional yearsRash and erythema have occurred.Gastrointestinal Adverse Reactions: One patient treated with alendronate (10 mg/day), who had history of peptic ulcer disease and gastrectomy and who was taking concomitant aspirin, developed an anastomotic ulcer with mild hemorrhage, which was considered drug related. Aspirin and alendronate sodium were discontinued and the patient recovered. In the Study and Study populations, 49 to 54% had history of gastrointestinal disorders at baseline and 54 to 89% used nonsteroidal anti-inflammatory drugs or aspirin at some time during the studies. See Warnings and Precautions (5.1).] Laboratory Test Findings: In double-blind, multicenter, controlled studies, asymptomatic, mild, and transient decreases in serum calcium and phosphate were observed in approximately 18% and 10%, respectively, of patients taking alendronate sodium versus approximately 12% and 3% of those taking placebo. However, the incidences of decreases in serum calcium to less than mg/dL (2 mm) and serum phosphate to less than or equal to mg/dL (0.65 mm) were similar in both treatment groups. Weekly DosingThe safety of alendronate 70 mg once weekly for the treatment of postmenopausal osteoporosis wasassessed in one-year, double-blind, multicenter study comparing alendronate 70 mg once weekly and alendronate 10 mg daily. The overall safety and tolerability profiles of once weekly alendronate 70 mg and alendronate 10 mg daily were similar. The adverse reactions considered by the investigators as possibly, probably, or definitely drug related in greater than or equal to 1% of patients in either treatment group are presented in Table 2.Table 2: Osteoporosis Treatment Studies in Postmenopausal Women Adverse Reactions Considered Possibly, Probably, or Definitely Drug Related by the Investigators and Reported in Greater Than or Equal to 1% of PatientsOnce Weekly Alendronate 70 mg% (n=519)Alendronate 10 mg/day% (n=370)Gastrointestinalabdominal pain3.73dyspepsia2.72.2acid regurgitation1.92.4nausea1.92.4abdominal distention11.4constipation0.81.6flatulence0.41.6gastritis0.21.1gastric ulcer01.1Musculoskeletalmusculoskeletal (bone, muscle, joint) pain2.93.2muscle cramp0.21.1Prevention of Osteoporosis in Postmenopausal WomenDaily DosingThe safety of alendronate mg/day in postmenopausal women 40 to 60 years of age has been evaluated in three double-blind, placebo-controlled studies involving over 1,400 patients randomized to receive alendronate for either two or three years. In these studies the overall safety profiles of alendronate mg/day and placebo were similar. Discontinuation of therapy due to any clinical adverse event occurred in 7.5% of 642 patients treated with alendronate mg/day and 5.7% of 648 patients treated with placebo.Weekly DosingThe safety of alendronate 35 mg once weekly compared to alendronate mg daily was evaluated in one-year, double-blind, multicenter study of 723 patients. The overall safety and tolerability profiles of once weekly alendronate 35 mg and alendronate mg daily were similar.The adverse reactions from these studies considered by the investigators as possibly, probably, or definitely drug related in greater than or equal to 1% of patients treated with either once weekly alendronate 35 mg, alendronate mg/day or placebo are presented in Table 3.Table 3: Osteoporosis Prevention Studies in Postmenopausal Women Adverse Reactions Considered Possibly, Probably, or Definitely Drug Related by the Investigators and Reported in Greater Than or Equal to 1% of PatientsTwo/Three-Year StudiesOne-Year StudyOnce WeeklyAlendronate5 mg/day% (n=642)Placebo% (n=648)Alendronate5 mg/day% (n=361)Alendronate 35 mg% (n=362)Gastrointestinaldyspepsia1.91.42.21.7abdominal pain1.73.44.22.2acid regurgitation1.42.54.24.7nausea1.41.42.51.4diarrhea1.11.71.10.6constipation0.90.51.70.3abdominal distention0.20.31.41.1Musculoskeletalmusculoskeletal (bone, muscle or joint) pain0.90.91.92.2Concomitant Use with Estrogen/Hormone Replacement TherapyIn two studies (of one and two years duration) of postmenopausal osteoporotic women (total: n=853), the safety and tolerability profile of combined treatment with alendronate 10 mg once daily and estrogen+- progestin (n=354) was consistent with those of the individual treatments.Osteoporosis in MenIn two placebo-controlled, double-blind, multicenter studies in men (a two-year study of alendronate 10 mg/day and one-year study of once weekly alendronate 70 mg) the rates of discontinuation of therapy due to any clinical adverse event were 2.7% for alendronate 10 mg/day vs. 10.5% for placebo, and 6.4% for once weekly alendronate 70 mg vs. 8.6% for placebo. The adverse reactions considered by the investigators as possibly, probably, or definitely drug related in greater than or equal to 2% of patients treated with either alendronate sodium or placebo are presented in Table 4.Table 4: Osteoporosis Studies in Men Adverse Reactions Considered Possibly, Probably, or Definitely Drug Related by the Investigators and Reported in Greater Than or Equal to 2% of PatientsTwo-year StudyOne-year StudyAlendronate 10 mg/day% (n=146)Placebo% (n=95)Once Weekly Alendronate 70 mg% (n=109)Placebo% (n=58)Gastrointestinalacid regurgitation4.13.200flatulence4.11.100gastroesophageal reflux disease0.73.22.80dyspepsia3.402.81.7diarrhea1.41.12.80abdominal pain2.11.10.93.4nausea2.1000Glucocorticoid-Induced OsteoporosisIn two, one-year, placebo-controlled, double-blind, multicenter studies in patients receiving glucocorticoid treatment, the overall safety and tolerability profiles of alendronate and 10 mg/day were generally similar to that of placebo. The adverse reactions considered by the investigators as possibly, probably, or definitely drug related in greater than or equal to 1% of patients treated with either alendronate or 10 mg/day or placebo are presented in Table 5.Table 5: One-Year Studies in Glucocorticoid-Treated Patients Adverse Reactions Considered Possibly, Probably, or Definitely Drug Related by the Investigators and Reported in Greater Than or Equal to 1% of PatientsAlendronate 10 mg/day% (n=157)Alendronate mg/day% (n=161)Placebo% (n=159)Gastrointestinalabdominal pain3.21.90acid regurgitation2.51.91.3constipation1.30.60melena1.31.30nausea0.61.20.6diarrhea001.3Nervous System/Psychiatricheadache0.601.3The overall safety and tolerability profile in the glucocorticoid-induced osteoporosis population that continued therapy for the second year of the studies (alendronate sodium: n=147) was consistent with that observed in the first year.Pagets Disease of BoneIn clinical studies (osteoporosis and Pagets disease), adverse events reported in 175 patients taking alendronate 40 mg/day for to 12 months were similar to those in postmenopausal women treated with alendronate 10 mg/day. However, there was an apparent increased incidence of upper gastrointestinal adverse reactions in patients taking alendronate 40 mg/day (17.7% alendronate vs. 10.2% placebo). One case of esophagitis and two cases of gastritis resulted in discontinuation of treatment.Additionally, musculoskeletal (bone, muscle or joint) pain, which has been described in patients with Pagets disease treated with other bisphosphonates, was considered by the investigators as possibly, probably, or definitely drug related in approximately 6% of patients treated with alendronate 40 mg/day versus approximately 1% of patients treated with placebo, but rarely resulted in discontinuation of therapy. Discontinuation of therapy due to any clinical adverse events occurred in 6.4% of patients with Pagets disease treated with alendronate 40 mg/day and 2.4% of patients treated with placebo.. 6.2 Post-Marketing Experience. The following adverse reactions have been identified during post-approval use of alendronate sodium. Because these reactions are reported voluntarily from population of uncertain size, it is not always possible to reliably estimate their frequency or establish causal relationship to drug exposure.Body as Whole: hypersensitivity reactions including urticaria and angioedema. Transient symptoms of myalgia, malaise, asthenia and fever have been reported with alendronate sodium, typically in association with initiation of treatment. Symptomatic hypocalcemia has occurred, generally in association with predisposing conditions. Peripheral edema. Gastrointestinal: esophagitis, esophageal erosions, esophageal ulcers, esophageal stricture or perforation, and oropharyngeal ulceration. Gastric or duodenal ulcers, some severe and with complications, have also been reported [see Dosage and Administration (2.6); Warnings and Precautions (5.1)]. Localized osteonecrosis of the jaw, generally associated with tooth extraction and/or local infection with delayed healing, has been reported [see Warnings and Precautions 5.4 )]. Musculoskeletal: bone, joint, and/or muscle pain, occasionally severe, and incapacitating [see Warnings and Precautions 5.3)]; joint swelling; low-energy femoral shaft and subtrochanteric fractures see Warnings and Precautions 5.5 )]. Nervous System: dizziness and vertigo. Pulmonary: acute asthma exacerbations. Skin: rash (occasionally with photosensitivity), pruritus, alopecia, severe skin reactions, including Stevens-Johnson syndrome and toxic epidermal necrolysis. Special Senses: uveitis, scleritis or episcleritis. Cholesteatoma of the external auditory canal (focal osteonecrosis).

CLINICAL PHARMACOLOGY SECTION.

12 CLINICAL PHARMACOLOGY. 12.1 Mechanism of Action. Animal studies have indicated the following mode of action. At the cellular level, alendronate shows preferential localization to sites of bone resorption, specifically under osteoclasts. The osteoclasts adhere normally to the bone surface but lack the ruffled border that is indicative of active resorption. Alendronate does not interfere with osteoclast recruitment or attachment, but it does inhibit osteoclast activity. Studies in mice on the localization of radioactive 3H] alendronate in bone showed about 10- fold higher uptake on osteoclast surfaces than on osteoblast surfaces. Bones examined and 49 days after 3H] alendronate administration in rats and mice, respectively, showed that normal bone was formed on top of the alendronate, which was incorporated inside the matrix. While incorporated in bone matrix, alendronate is not pharmacologically active. Thus, alendronate must be continuously administered to suppress osteoclasts on newly formed resorption surfaces. Histomorphometry in baboons and rats showed that alendronate treatment reduces bone turnover (i.e., the number of sites at which bone is remodeled). In addition, bone formation exceeds bone resorption at these remodeling sites, leading to progressive gains in bone mass. 12.2 Pharmacodynamics. Alendronate is bisphosphonate that binds to bone hydroxyapatite and specifically inhibits the activity of osteoclasts, the bone-resorbing cells. Alendronate reduces bone resorption with no direct effect on bone formation, although the latter process is ultimately reduced because bone resorption and formation are coupled during bone turnover.Osteoporosis in Postmenopausal WomenOsteoporosis is characterized by low bone mass that leads to an increased risk of fracture. The diagnosis can be confirmed by the finding of low bone mass, evidence of fracture on x-ray, history of osteoporotic fracture, or height loss or kyphosis, indicative of vertebral (spinal) fracture. Osteoporosis occurs in both males and females but is most common among women following the menopause, when bone turnover increases and the rate of bone resorption exceeds that of bone formation. These changes result in progressive bone loss and lead to osteoporosis in significant proportion of women over age 50. Fractures, usually of the spine, hip, and wrist, are the common consequences. From age 50 to age 90, the risk of hip fracture in white women increases 50-fold and the risk of vertebral fracture 15- to 30-fold. It is estimated that approximately 40% of 50-year-old women will sustain one or more osteoporosis-related fractures of the spine, hip, or wrist during their remaining lifetimes. Hip fractures, in particular, are associated with substantial morbidity, disability, and mortality.Daily oral doses of alendronate (5, 20, and 40 mg for six weeks) in postmenopausal women produced biochemical changes indicative of dose-dependent inhibition of bone resorption, including decreases in urinary calcium and urinary markers of bone collagen degradation (such as deoxypyridinoline and cross-linked N-telopeptides of type collagen). These biochemical changes tended to return toward baseline values as early as weeks following the discontinuation of therapy with alendronate and did not differ from placebo after months.Long-term treatment of osteoporosis with alendronate 10 mg/day (for up to five years) reduced urinary excretion of markers of bone resorption, deoxypyridinoline and cross-linked N-telopeptides of type collagen, by approximately 50% and 70%, respectively, to reach levels similar to those seen in healthy premenopausal women. Similar decreases were seen in patients in osteoporosis prevention studies who received alendronate mg/day. The decrease in the rate of bone resorption indicated by these markers was evident as early as one month and at three to six months reached plateau that was maintained for the entire duration of treatment with alendronate sodium. In osteoporosis treatment studies alendronate 10 mg/day decreased the markers of bone formation, osteocalcin and bone specific alkaline phosphatase by approximately 50%, and total serum alkaline phosphatase by approximately 25 to 30% to reach plateau after to 12 months. In osteoporosis prevention studies alendronate mg/day decreased osteocalcin and total serum alkaline phosphatase by approximately 40% and 15%, respectively. Similar reductions in the rate of bone turnover were observed in postmenopausal women during one-year studies with once weekly alendronate 70 mg for the treatment of osteoporosis and once weekly alendronate 35 mg for the prevention of osteoporosis. These data indicate that the rate of bone turnover reached new steady- state, despite the progressive increase in the total amount of alendronate deposited within bone.As result of inhibition of bone resorption, asymptomatic reductions in serum calcium and phosphate concentrations were also observed following treatment with alendronate sodium. In the long-term studies, reductions from baseline in serum calcium (approximately 2%) and phosphate (approximately to 6%) were evident the first month after the initiation of alendronate 10 mg. No further decreases in serum calcium were observed for the five-year duration of treatment; however, serum phosphate returned toward prestudy levels during years three through five. Similar reductions were observed with alendronate mg/day. In one-year studies with once weekly alendronate 35 and 70 mg, similar reductions were observed at and 12 months. The reduction in serum phosphate may reflect not only the positive bone mineral balance due to alendronate sodium but also decrease in renal phosphate reabsorption.Osteoporosis in MenTreatment of men with osteoporosis with alendronate 10 mg/day for two years reduced urinary excretion of cross-linked N-telopeptides of type collagen by approximately 60% and bone-specific alkaline phosphatase by approximately 40%. Similar reductions were observed in one-year study in men with osteoporosis receiving once weekly alendronate 70 mg.Glucocorticoid-Induced OsteoporosisSustained use of glucocorticoids is commonly associated with development of osteoporosis and resulting fractures (especially vertebral, hip, and rib). It occurs in both males and females of all ages. Osteoporosis occurs as result of inhibited bone formation and increased bone resorption resulting in net bone loss. Alendronate decreases bone resorption without directly inhibiting bone formation.In clinical studies of up to two years duration, alendronate and 10 mg/day reduced cross-linked N- telopeptides of type collagen (a marker of bone resorption) by approximately 60% and reduced bone- specific alkaline phosphatase and total serum alkaline phosphatase (markers of bone formation) by approximately 15 to 30% and to 18%, respectively. As result of inhibition of bone resorption, alendronate and 10 mg/day induced asymptomatic decreases in serum calcium (approximately to 2%) and serum phosphate (approximately to 8%).Pagets Disease of BonePagets disease of bone is chronic, focal skeletal disorder characterized by greatly increased and disorderly bone remodeling. Excessive osteoclastic bone resorption is followed by osteoblastic new bone formation, leading to the replacement of the normal bone architecture by disorganized, enlarged, and weakened bone structure.Clinical manifestations of Pagets disease range from no symptoms to severe morbidity due to bone pain, bone deformity, pathological fractures, and neurological and other complications. Serum alkaline phosphatase, the most frequently used biochemical index of disease activity, provides an objective measure of disease severity and response to therapy.Alendronate sodium decreases the rate of bone resorption directly, which leads to an indirect decrease in bone formation. In clinical trials, alendronate 40 mg once daily for six months produced significant decreases in serum alkaline phosphatase as well as in urinary markers of bone collagen degradation. As result of the inhibition of bone resorption, alendronate sodium induced generally mild, transient, and asymptomatic decreases in serum calcium and phosphate.. 12.3 Pharmacokinetics. AbsorptionRelative to an intravenous reference dose, the mean oral bioavailability of alendronate in women was 0.64% for doses ranging from to 70 mg when administered after an overnight fast and two hours before standardized breakfast. Oral bioavailability of the 10 mg tablet in men (0.59%) was similar to that in women when administered after an overnight fast and hours before breakfast.Alendronate 70 mg oral solution and alendronate 70 mg tablet are equally bioavailable.A study examining the effect of timing of meal on the bioavailability of alendronate was performed in 49 postmenopausal women. Bioavailability was decreased (by approximately 40%) when 10 mg alendronate was administered either 0.5 or hour before standardized breakfast, when compared to dosing hours before eating. In studies of treatment and prevention of osteoporosis, alendronate was effective when administered at least 30 minutes before breakfast.Bioavailability was negligible whether alendronate was administered with or up to two hours after standardized breakfast. Concomitant administration of alendronate with coffee or orange juice reduced bioavailability by approximately 60%.DistributionPreclinical studies (in male rats) show that alendronate transiently distributes to soft tissues following mg/kg intravenous administration but is then rapidly redistributed to bone or excreted in the urine. The mean steady-state volume of distribution, exclusive of bone, is at least 28 in humans. Concentrationsof drug in plasma following therapeutic oral doses are too low (less than ng/mL) for analytical detection. Protein binding in human plasma is approximately 78%.MetabolismThere is no evidence that alendronate is metabolized in animals or humans.ExcretionFollowing single intravenous dose of 14C] alendronate, approximately 50% of the radioactivity was excreted in the urine within 72 hours and little or no radioactivity was recovered in the feces. Following single 10 mg intravenous dose, the renal clearance of alendronate was 71 mL/min (64, 78; 90% confidence interval [CI]), and systemic clearance did not exceed 200 mL/min. Plasma concentrations fell by more than 95% within hours following intravenous administration. The terminal half-life in humans is estimated to exceed 10 years, probably reflecting release of alendronate from the skeleton. Based on the above, it is estimated that after 10 years of oral treatment with alendronate (10 mg daily) the amount of alendronate released daily from the skeleton is approximately 25% of that absorbed from the gastrointestinal tract.Specific PopulationsGender: Bioavailability and the fraction of an intravenous dose excreted in urine were similar in men and women. Geriatric: Bioavailability and disposition (urinary excretion) were similar in elderly and younger patients. No dosage adjustment is necessary in elderly patients. Race: Pharmacokinetic differences due to race have not been studied. Renal Impairment: Preclinical studies show that, in rats with kidney failure, increasing amounts of drug are present in plasma, kidney, spleen, and tibia. In healthy controls, drug that is not deposited in bone is rapidly excreted in the urine. No evidence of saturation of bone uptake was found after weeks dosing with cumulative intravenous doses of 35 mg/kg in young male rats. Although no formal renal impairment pharmacokinetic study has been conducted in patients, it is likely that, as in animals, elimination of alendronate via the kidney will be reduced in patients with impaired renal function. Therefore, somewhat greater accumulation of alendronate in bone might be expected in patients with impaired renal function. No dosage adjustment is necessary for patients with creatinine clearance 35 to 60 mL/min. Alendronate sodium is not recommended for patients with creatinine clearance less than 35 mL/min due to lack of experience with alendronate in renal failure.Hepatic Impairment: As there is evidence that alendronate is not metabolized or excreted in the bile, no studies were conducted in patients with hepatic impairment. No dosage adjustment is necessary. Drug InteractionsIntravenous ranitidine was shown to double the bioavailability of oral alendronate. The clinical significance of this increased bioavailability and whether similar increases will occur in patients given oral H2-antagonists is unknown.In healthy subjects, oral prednisone (20 mg three times daily for five days) did not produce clinically meaningful change in the oral bioavailability of alendronate (a mean increase ranging from 20 to 44%).Products containing calcium and other multivalent cations are likely to interfere with absorption of alendronate.

CLINICAL STUDIES SECTION.

14 CLINICAL STUDIES. 14.1 Treatment of Osteoporosis in Postmenopausal Women. Daily DosingThe efficacy of alendronate 10 mg daily was assessed in four clinical trials. Study 1, three-year, multicenter, double-blind, placebo-controlled, U.S. clinical study enrolled 478 patients with BMD T- score at or below minus 2.5 with or without prior vertebral fracture; Study 2, three-year, multicenter, double-blind, placebo-controlled Multinational clinical study enrolled 516 patients with BMD T- score at or below minus 2.5 with or without prior vertebral fracture; Study 3, the Three-Year Study of the Fracture Intervention Trial (FIT) study which enrolled 2027 postmenopausal patients with at least one baseline vertebral fracture; and Study 4, the Four-Year Study of FIT: study which enrolled 4432 postmenopausal patients with low bone mass but without baseline vertebral fracture.Effect on Fracture IncidenceTo assess the effects of alendronate sodium on the incidence of vertebral fractures (detected by digitized radiography; approximately one third of these were clinically symptomatic), the U.S. and Multinational studies were combined in an analysis that compared placebo to the pooled dosage groups of alendronate (5 or 10 mg for three years or 20 mg for two years followed by mg for one year).There was statistically significant reduction in the proportion of patients treated with alendronate sodium experiencing one or more new vertebral fractures relative to those treated with placebo (3.2% vs. 6.2%; 48% relative risk reduction). reduction in the total number of new vertebral fractures (4.2 vs. 11.3 per 100 patients) was also observed. In the pooled analysis, patients who received alendronate sodium had loss in stature that was statistically significantly less than was observed in those who received placebo (-3 mm vs. -4.6 mm).The Fracture Intervention Trial (FIT) consisted of two studies in postmenopausal women: the Three- Year Study of patients who had at least one baseline radiographic vertebral fracture and the Four-Year Study of patients with low bone mass but without baseline vertebral fracture. In both studies of FIT, 96% of randomized patients completed the studies (i.e., had closeout visit at the scheduled end of the study); approximately 80% of patients were still taking study medication upon completion.Fracture Intervention Trial: Three-Year Study (patients with at least one baseline radiographic vertebral fracture)This randomized, double-blind, placebo-controlled, 2027-patient study (alendronate sodium, n=1022; placebo, n=1005) demonstrated that treatment with alendronate sodium resulted in statistically significant reductions in fracture incidence at three years as shown in Table 6.Table 6: Effect of Alendronate Sodium on Fracture Incidence in the Three-Year Study of FIT (patients with vertebral fracture at baseline)Percent of PatientsAlendronate Sodium (n=1022)Placebo (n=1005)Absolute Reduction in Fracture IncidenceRelative Reduction in FractureRisk %Patients with:Vertebral fractures (diagnosed by X-ray)>=1 new vertebral fracture7.9157.147+>=2 new vertebral fractures0.54.94.490+Clinical (symptomatic) fracturesAny clinical (symptomatic) fracture13.818.14.326>=1 clinical (symptomatic) vertebral fracture2.352.754Hip fracture1.12.21.151Wrist (forearm) fracture2.24.11.948Number evaluable for vertebral fractures: alendronate sodium, n=984; placebo, n=966+p<0.001, p=0.007, p<0.001, p<0.05Furthermore, in this population of patients with baseline vertebral fracture, treatment with alendronate sodium significantly reduced the incidence of hospitalizations (25% vs. 30.7%).In the Three-Year Study of FIT, fractures of the hip occurred in 22 (2.2%) of 1005 patients on placebo and 11 (1.1%) of 1022 patients on alendronate sodium, p=0.047. Figure displays the cumulative incidence of hip fractures in this study.Figure 1:Cumulative Incidence of Hip Fractures in the Three-Year Study of FIT(patients with radiographic vertebral fracture at baseline)Fracture Intervention Trial: Four-Year Study (patients with low bone mass but without baseline radiographic vertebral fracture)This randomized, double-blind, placebo-controlled, 4432-patient study (alendronate sodium, n=2214; placebo, n=2218) further investigated the reduction in fracture incidence due to alendronate sodium. The intent of the study was to recruit women with osteoporosis, defined as baseline femoral neck BMD at least two standard deviations below the mean for young adult women. However, due to subsequent revisions to the normative values for femoral neck BMD, 31% of patients were found not to meet this entry criterion and thus this study included both osteoporotic and non-osteoporotic women.The results are shown in Table for the patients with osteoporosis.Table 7: Effect of Alendronate Sodium on Fracture Incidence in Osteoporotic Patients in the Four-Year Study of FIT (patients without vertebral fracture at baseline)Percent of PatientsAlendronate Sodium (n=1545)Placebo (n=1521)Absolute Reduction in Fracture IncidenceRelative Reduction in Fracture Risk (%)Patients with: Vertebral fractures (diagnosed by X-ray)+>=1 new vertebral fracture2.54.82.348>=2 new vertebral fractures0.10.60.878Clinical (symptomatic) fracturesAny clinical (symptomatic) fracture12.916.23.322>=1 clinical (symptomatic) vertebral fracture11.60.641 (NS)Hip fracture11.40.429 (NS)Wrist (forearm) fracture3.93.8-0.1NSBaseline femoral neck BMD at least SD below the mean for young adult women+ Number evaluable for vertebral fractures: alendronate sodium, n=1426; placebo, n=1428 p<0.001, p=0.035, p=0.01Not significant. This study was not powered to detect differences at these sites.Fracture Results Across StudiesIn the Three-Year Study of FIT, alendronate sodium reduced the percentage of women experiencing at least one new radiographic vertebral fracture from 15% to 7.9% (47% relative risk reduction, p<0.001); in the Four-Year Study of FIT, the percentage was reduced from 3.8% to 2.1% (44% relative risk reduction, p=0.001); and in the combined U.S./Multinational studies, from 6.2% to 3.2% (48% relative risk reduction, p=0.034).Alendronate sodium reduced the percentage of women experiencing multiple (two or more) new vertebral fractures from 4.2% to 0.6% (87% relative risk reduction, p<0.001) in the combined U.S./Multinational studies and from 4.9% to 0.5% (90% relative risk reduction, p<0.001) in the Three- Year Study of FIT. In the Four-Year Study of FIT, alendronate sodium reduced the percentage of osteoporotic women experiencing multiple vertebral fractures from 0.6% to 0.1% (78% relative risk reduction, p=0.035).Thus, alendronate sodium reduced the incidence of radiographic vertebral fractures in osteoporotic women whether or not they had previous radiographic vertebral fracture.Effect on Bone Mineral DensityThe bone mineral density efficacy of alendronate 10 mg once daily in postmenopausal women, 44 to 84 years of age, with osteoporosis (lumbar spine bone mineral density [BMD] of at least standard deviations below the premenopausal mean) was demonstrated in four double-blind, placebo-controlled clinical studies of two or three years duration.Figure shows the mean increases in BMD of the lumbar spine, femoral neck, and trochanter in patients receiving alendronate 10 mg/day relative to placebo-treated patients at three years for each of these studies.Figure 2: Osteoporosis Treatment Studies in Postmenopausal Women Increase in BMD Alendronate 10 mg/day at Three YearsAt three years significant increases in BMD, relative both to baseline and placebo, were seen at each measurement site in each study in patients who received alendronate 10 mg/day. Total body BMD also increased significantly in each study, suggesting that the increases in bone mass of the spine and hip did not occur at the expense of other skeletal sites. Increases in BMD were evident as early as three months and continued throughout the three years of treatment. (See Figure for lumbar spine results.) In the two-year extension of these studies, treatment of 147 patients with alendronate 10 mg/day resulted in continued increases in BMD at the lumbar spine and trochanter (absolute additional increases between years and 5: lumbar spine, 0.94%; trochanter, 0.88%). BMD at the femoral neck, forearm and total body were maintained. Alendronate sodium was similarly effective regardless of age, race, baseline rate of bone turnover, and baseline BMD in the range studied (at least standard deviations below the premenopausal mean).Figure 3: Osteoporosis Treatment Studies in Postmenopausal WomenTime Course of Effect of Alendronate 10 mg/day Versus Placebo: Lumbar spine BMD Percent Change From BaselineIn patients with postmenopausal osteoporosis treated with alendronate 10 mg/day for one or two years, the effects of treatment withdrawal were assessed. Following discontinuation, there were no further increases in bone mass and the rates of bone loss were similar to those of the placebo groups.Bone HistologyBone histology in 270 postmenopausal patients with osteoporosis treated with alendronate at doses ranging from to 20 mg/day for one, two, or three years revealed normal mineralization and structure, as well as the expected decrease in bone turnover relative to placebo. These data, together with the normal bone histology and increased bone strength observed in rats and baboons exposed to long-term alendronate treatment, support the conclusion that bone formed during therapy with alendronate sodium is of normal quality.Effect on HeightAlendronate sodium, over three- or four-year period, was associated with statistically significant reductions in loss of height vs. placebo in patients with and without baseline radiographic vertebral fractures. At the end of the FIT studies, the between-treatment group differences were 3.2 mm in the Three-Year Study and 1.3 mm in the Four-Year Study.Weekly DosingThe therapeutic equivalence of once-weekly alendronate 70 mg (n=519) and alendronate 10 mg daily (n=370) was demonstrated in one-year, double-blind, multicenter study of postmenopausal women with osteoporosis. In the primary analysis of completers, the mean increases from baseline in lumbar spine BMD at one year were 5.1% (4.8, 5.4%; 95% CI) in the 70 mg once-weekly group (n=440) and 5.4% (5, 5.8%; 95% CI) in the 10 mg daily group (n=330). The two treatment groups were also similar with regard to BMD increases at other skeletal sites. The results of the intention-to-treat analysis were consistent with the primary analysis of completers.Concomitant Use with Estrogen/Hormone Replacement Therapy (HRT)The effects on BMD of treatment with alendronate 10 mg once daily and conjugated estrogen (0.625 mg/day) either alone or in combination were assessed in two-year, double-blind, placebo-controlled study of hysterectomized postmenopausal osteoporotic women (n=425). At two years, the increases in lumbar spine BMD from baseline were significantly greater with the combination (8.3%) than with either estrogen or alendronate sodium alone (both 6%).The effects on BMD when alendronate sodium was added to stable doses (for at least one year) of HRT (estrogen +- progestin) were assessed in one-year, double-blind, placebo-controlled study in postmenopausal osteoporotic women (n=428). The addition of alendronate 10 mg once daily to HRT produced, at one year, significantly greater increases in lumbar spine BMD (3.7%) vs. HRT alone (1.1%).In these studies, significant increases or favorable trends in BMD for combined therapy compared with HRT alone were seen at the total hip, femoral neck, and trochanter. No significant effect was seen for total body BMD.Histomorphometric studies of transiliac biopsies in 92 subjects showed normal bone architecture. Compared to placebo there was 98% suppression of bone turnover (as assessed by mineralizing surface) after 18 months of combined treatment with alendronate sodium and HRT, 94% on alendronate sodium alone, and 78% on HRT alone. The long-term effects of combined alendronate sodium and HRT on fracture occurrence and fracture healing have not been studied.. figure 1. figure 2. figure 3. 14.2 Prevention of Osteoporosis in Postmenopausal Women. Daily DosingPrevention of bone loss was demonstrated in two double-blind, placebo-controlled studies of postmenopausal women 40 to 60 years of age. One thousand six hundred nine patients (alendronate mg/day; n=498) who were at least six months postmenopausal were entered into two-year study without regard to their baseline BMD. In the other study, 447 patients (alendronate mg/day; n=88), who were between six months and three years postmenopause, were treated for up to three years. In the placebo-treated patients BMD losses of approximately 1% per year were seen at the spine, hip (femoral neck and trochanter) and total body. In contrast, alendronate mg/day prevented bone loss in the majority of patients and induced significant increases in mean bone mass at each of these sites (see Figure 4). In addition, alendronate mg/day reduced the rate of bone loss at the forearm by approximately half relative to placebo. Alendronate mg/day was similarly effective in this population regardless of age, time since menopause, race and baseline rate of bone turnover.Bone HistologyBone histology was normal in the 28 patients biopsied at the end of three years who received alendronate at doses of up to 10 mg/day.Weekly DosingThe therapeutic equivalence of once weekly alendronate 35 mg (n=362) and alendronate mg daily (n=361) was demonstrated in one-year, double-blind, multicenter study of postmenopausal women without osteoporosis. In the primary analysis of completers, the mean increases from baseline in lumbar spine BMD at one year were 2.9% (2.6, 3.2%; 95% CI) in the 35 mg once-weekly group (n=307) and 3.2% (2.9, 3.5%; 95% CI) in the mg daily group (n=298). The two treatment groups were also similar with regard to BMD increases at other skeletal sites. The results of the intention-to-treat analysis were consistent with the primary analysis of completers.. figure 4. 14.3 Treatment to Increase Bone Mass in Men with Osteoporosis. The efficacy of alendronate sodium in men with hypogonadal or idiopathic osteoporosis was demonstrated in two clinical studies.Daily DosingA two-year, double-blind, placebo-controlled, multicenter study of alendronate 10 mg once daily enrolled total of 241 men between the ages of 31 and 87 (mean, 63). All patients in the trial had either BMD T-score less than or equal to -2 at the femoral neck and less than or equal to -1 at the lumbar spine, or baseline osteoporotic fracture and BMD T-score less than or equal to -1 at the femoral neck. At two years, the mean increases relative to placebo in BMD in men receiving alendronate 10 mg/day were significant at the following sites: lumbar spine, 5.3%; femoral neck, 2.6%; trochanter, 3.1%; and total body, 1.6%. Treatment with alendronate sodium also reduced height loss (alendronate sodium, -0.6 mm vs. placebo, -2.4 mm).Weekly DosingA one-year, double-blind, placebo-controlled, multicenter study of once weekly alendronate 70 mg enrolled total of 167 men between the ages of 38 and 91 (mean, 66). Patients in the study had either BMD T-score less than or equal to -2 at the femoral neck and less than or equal to -1 at the lumbar spine, or BMD T-score less than or equal to -2 at the lumbar spine and less than or equal to -1 at the femoral neck, or baseline osteoporotic fracture and BMD T-score less than or equal to -1 at the femoral neck. At one year, the mean increases relative to placebo in BMD in men receiving alendronate 70 mg once weekly were significant at the following sites: lumbar spine, 2.8%; femoral neck, 1.9%; trochanter, 2%; and total body, 1.2%. These increases in BMD were similar to those seen at one year in the 10 mg once-daily study.In both studies, BMD responses were similar regardless of age (greater than or equal to 65 years vs. less than 65 years), gonadal function (baseline testosterone less than ng/dL vs. greater than or equal to ng/dL), or baseline BMD (femoral neck and lumbar spine T-score less than or equal to -2.5 vs. greater than -2.5).. 14.4 Treatment of Glucocorticoid-Induced Osteoporosis. The efficacy of alendronate and 10 mg once daily in men and women receiving glucocorticoids (at least 7.5 mg/day of prednisone or equivalent) was demonstrated in two, one-year, double-blind, randomized, placebo-controlled, multicenter studies of virtually identical design, one performed in the United States and the other in 15 different countries (Multinational [which also included alendronate 2.5 mg/day]). These studies enrolled 232 and 328 patients, respectively, between the ages of 17 and 83 with variety of glucocorticoid-requiring diseases. Patients received supplemental calcium and vitamin D. Figure shows the mean increases relative to placebo in BMD of the lumbar spine, femoral neck, and trochanter in patients receiving alendronate mg/day for each study.After one year, significant increases relative to placebo in BMD were seen in the combined studies at each of these sites in patients who received alendronate mg/day. In the placebo-treated patients, significant decrease in BMD occurred at the femoral neck (-1.2%), and smaller decreases were seen at the lumbar spine and trochanter. Total body BMD was maintained with alendronate mg/day. The increases in BMD with alendronate 10 mg/day were similar to those with alendronate mg/day in all patients except for postmenopausal women not receiving estrogen therapy. In these women, the increases (relative to placebo) with alendronate 10 mg/day were greater than those with alendronate mg/day at the lumbar spine (4.1% vs. 1.6%) and trochanter (2.8% vs. 1.7%), but not at other sites. Alendronate sodium was effective regardless of dose or duration of glucocorticoid use. In addition, alendronate sodium was similarly effective regardless of age (less than 65 vs. greater than or equal to 65 years), race (Caucasian vs. other races), gender, underlying disease, baseline BMD, baseline bone turnover, and use with variety of common medications.Bone histology was normal in the 49 patients biopsied at the end of one year who received alendronate at doses of up to 10 mg/day.Of the original 560 patients in these studies, 208 patients who remained on at least 7.5 mg/day of prednisone or equivalent continued into one-year double-blind extension. After two years of treatment, spine BMD increased by 3.7% and 5% relative to placebo with alendronate and 10 mg/day, respectively. Significant increases in BMD (relative to placebo) were also observed at the femoral neck, trochanter, and total body.After one year, 2.3% of patients treated with alendronate or 10 mg/day (pooled) vs. 3.7% of those treated with placebo experienced new vertebral fracture (not significant). However, in the population studied for two years, treatment with alendronate (pooled dosage groups: or 10 mg for two years or 2.5 mg for one year followed by 10 mg for one year) significantly reduced the incidence of patients with new vertebral fracture (alendronate 0.7% vs. placebo 6.8%).. figure 5. 14.5 Treatment of Pagets Disease of Bone. The efficacy of alendronate 40 mg once daily for six months was demonstrated in two double-blind clinical studies of male and female patients with moderate to severe Pagets disease (alkaline phosphatase at least twice the upper limit of normal): placebo-controlled, multinational study and U.S. comparative study with etidronate disodium 400 mg/day. Figure shows the mean percent changes from baseline in serum alkaline phosphatase for up to six months of randomized treatment.At six months the suppression in alkaline phosphatase in patients treated with alendronate sodium was significantly greater than that achieved with etidronate and contrasted with the complete lack of response in placebo-treated patients. Response (defined as either normalization of serum alkaline phosphatase or decrease from baseline greater than or equal to 60%) occurred in approximately 85% of patients treated with alendronate sodium in the combined studies vs. 30% in the etidronate group and 0% in the placebo group. Alendronate sodium was similarly effective regardless of age, gender, race, prior use of other bisphosphonates, or baseline alkaline phosphatase within the range studied (at least twice the upper limit of normal).Bone histology was evaluated in 33 patients with Pagets disease treated with alendronate 40 mg/day for months. As in patients treated for osteoporosis [see Clinical Studies 14.1)], alendronate sodium did not impair mineralization, and the expected decrease in the rate of bone turnover was observed. Normal lamellar bone was produced during treatment with alendronate sodium, even where preexisting bone was woven and disorganized. Overall, bone histology data support the conclusion that bone formed during treatment with alendronate sodium is of normal quality. figure 6.

CLINICAL TRIALS EXPERIENCE SECTION.

6.1 Clinical Trials Experience. Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.Treatment of Osteoporosis in Postmenopausal WomenDaily DosingThe safety of alendronate sodium in the treatment of postmenopausal osteoporosis was assessed in four clinical trials that enrolled 7453 women aged 44 to 84 years. Study and Study were identically designed, three-year, placebo-controlled, double-blind, multicenter studies (United States and Multinational n=994); Study was the three-year vertebral fracture cohort of the Fracture Intervention Trial [FIT] (n=2027) and Study was the four-year clinical fracture cohort of FIT (n=4432). Overall, 3620 patients were exposed to placebo and 3432 patients exposed to alendronate sodium. Patients with pre-existing gastrointestinal disease and concomitant use of non-steroidal anti-inflammatory drugs were included in these clinical trials. In Study and Study all women received 500 mg elemental calcium as carbonate. In Study and Study all women with dietary calcium intake less than 1000 mg per day received 500 mg calcium and 250 international units Vitamin per day.Among patients treated with alendronate 10 mg or placebo in Study and Study 2, and all patients in Study and Study 4, the incidence of all-cause mortality was 1.8% in the placebo group and 1.8% in the alendronate sodium group. The incidence of serious adverse event was 30.7% in the placebo group and 30.9% in the alendronate sodium group. The percentage of patients who discontinued the study due to any clinical adverse event was 9.5% in the placebo group and 8.9% in the alendronate sodium group. Adverse reactions from these studies considered by the investigators as possibly, probably, or definitely drug related in greater than or equal to 1% of patients treated with either alendronate sodium or placebo are presented in Table 1.Table 1: Osteoporosis Treatment Studies in Postmenopausal Women Adverse Reactions Considered Possibly, Probably, or Definitely Drug Related by the Investigators and Reported in Greater Than or Equal to 1% of PatientUnited States/ Multinational StudiesFracture Intervention TrialAlendronate Sodium% (n=196)Placebo% (n=397)Alendronate Sodium% (n=3236)Placebo% (n=3223)Gastrointestinalabdominal pain6.64.81.51.5nausea3.641.11.5dyspepsia3.63.51.11.2constipation3.11.800.2diarrhea3.11.80.60.3flatulence2.60.50.20.3acid regurgitation24.31.10.9esophageal ulcer1.500.10.1vomiting11.50.20.3dysphagia100.10.1abdominal distention10.800gastritis0.51.30.60.7Musculoskeletalmusculoskeletal (bone, muscle or joint) pain4.10.40.3muscle cramp00.20.1Nervous System/Psychiatricheadache2.60.20.2dizziness000.1Special Sensetaste perversion0.50.1010 mg/day for three years5 mg/day for years and 10 mg/day for either or additional yearsRash and erythema have occurred.Gastrointestinal Adverse Reactions: One patient treated with alendronate (10 mg/day), who had history of peptic ulcer disease and gastrectomy and who was taking concomitant aspirin, developed an anastomotic ulcer with mild hemorrhage, which was considered drug related. Aspirin and alendronate sodium were discontinued and the patient recovered. In the Study and Study populations, 49 to 54% had history of gastrointestinal disorders at baseline and 54 to 89% used nonsteroidal anti-inflammatory drugs or aspirin at some time during the studies. See Warnings and Precautions (5.1).] Laboratory Test Findings: In double-blind, multicenter, controlled studies, asymptomatic, mild, and transient decreases in serum calcium and phosphate were observed in approximately 18% and 10%, respectively, of patients taking alendronate sodium versus approximately 12% and 3% of those taking placebo. However, the incidences of decreases in serum calcium to less than mg/dL (2 mm) and serum phosphate to less than or equal to mg/dL (0.65 mm) were similar in both treatment groups. Weekly DosingThe safety of alendronate 70 mg once weekly for the treatment of postmenopausal osteoporosis wasassessed in one-year, double-blind, multicenter study comparing alendronate 70 mg once weekly and alendronate 10 mg daily. The overall safety and tolerability profiles of once weekly alendronate 70 mg and alendronate 10 mg daily were similar. The adverse reactions considered by the investigators as possibly, probably, or definitely drug related in greater than or equal to 1% of patients in either treatment group are presented in Table 2.Table 2: Osteoporosis Treatment Studies in Postmenopausal Women Adverse Reactions Considered Possibly, Probably, or Definitely Drug Related by the Investigators and Reported in Greater Than or Equal to 1% of PatientsOnce Weekly Alendronate 70 mg% (n=519)Alendronate 10 mg/day% (n=370)Gastrointestinalabdominal pain3.73dyspepsia2.72.2acid regurgitation1.92.4nausea1.92.4abdominal distention11.4constipation0.81.6flatulence0.41.6gastritis0.21.1gastric ulcer01.1Musculoskeletalmusculoskeletal (bone, muscle, joint) pain2.93.2muscle cramp0.21.1Prevention of Osteoporosis in Postmenopausal WomenDaily DosingThe safety of alendronate mg/day in postmenopausal women 40 to 60 years of age has been evaluated in three double-blind, placebo-controlled studies involving over 1,400 patients randomized to receive alendronate for either two or three years. In these studies the overall safety profiles of alendronate mg/day and placebo were similar. Discontinuation of therapy due to any clinical adverse event occurred in 7.5% of 642 patients treated with alendronate mg/day and 5.7% of 648 patients treated with placebo.Weekly DosingThe safety of alendronate 35 mg once weekly compared to alendronate mg daily was evaluated in one-year, double-blind, multicenter study of 723 patients. The overall safety and tolerability profiles of once weekly alendronate 35 mg and alendronate mg daily were similar.The adverse reactions from these studies considered by the investigators as possibly, probably, or definitely drug related in greater than or equal to 1% of patients treated with either once weekly alendronate 35 mg, alendronate mg/day or placebo are presented in Table 3.Table 3: Osteoporosis Prevention Studies in Postmenopausal Women Adverse Reactions Considered Possibly, Probably, or Definitely Drug Related by the Investigators and Reported in Greater Than or Equal to 1% of PatientsTwo/Three-Year StudiesOne-Year StudyOnce WeeklyAlendronate5 mg/day% (n=642)Placebo% (n=648)Alendronate5 mg/day% (n=361)Alendronate 35 mg% (n=362)Gastrointestinaldyspepsia1.91.42.21.7abdominal pain1.73.44.22.2acid regurgitation1.42.54.24.7nausea1.41.42.51.4diarrhea1.11.71.10.6constipation0.90.51.70.3abdominal distention0.20.31.41.1Musculoskeletalmusculoskeletal (bone, muscle or joint) pain0.90.91.92.2Concomitant Use with Estrogen/Hormone Replacement TherapyIn two studies (of one and two years duration) of postmenopausal osteoporotic women (total: n=853), the safety and tolerability profile of combined treatment with alendronate 10 mg once daily and estrogen+- progestin (n=354) was consistent with those of the individual treatments.Osteoporosis in MenIn two placebo-controlled, double-blind, multicenter studies in men (a two-year study of alendronate 10 mg/day and one-year study of once weekly alendronate 70 mg) the rates of discontinuation of therapy due to any clinical adverse event were 2.7% for alendronate 10 mg/day vs. 10.5% for placebo, and 6.4% for once weekly alendronate 70 mg vs. 8.6% for placebo. The adverse reactions considered by the investigators as possibly, probably, or definitely drug related in greater than or equal to 2% of patients treated with either alendronate sodium or placebo are presented in Table 4.Table 4: Osteoporosis Studies in Men Adverse Reactions Considered Possibly, Probably, or Definitely Drug Related by the Investigators and Reported in Greater Than or Equal to 2% of PatientsTwo-year StudyOne-year StudyAlendronate 10 mg/day% (n=146)Placebo% (n=95)Once Weekly Alendronate 70 mg% (n=109)Placebo% (n=58)Gastrointestinalacid regurgitation4.13.200flatulence4.11.100gastroesophageal reflux disease0.73.22.80dyspepsia3.402.81.7diarrhea1.41.12.80abdominal pain2.11.10.93.4nausea2.1000Glucocorticoid-Induced OsteoporosisIn two, one-year, placebo-controlled, double-blind, multicenter studies in patients receiving glucocorticoid treatment, the overall safety and tolerability profiles of alendronate and 10 mg/day were generally similar to that of placebo. The adverse reactions considered by the investigators as possibly, probably, or definitely drug related in greater than or equal to 1% of patients treated with either alendronate or 10 mg/day or placebo are presented in Table 5.Table 5: One-Year Studies in Glucocorticoid-Treated Patients Adverse Reactions Considered Possibly, Probably, or Definitely Drug Related by the Investigators and Reported in Greater Than or Equal to 1% of PatientsAlendronate 10 mg/day% (n=157)Alendronate mg/day% (n=161)Placebo% (n=159)Gastrointestinalabdominal pain3.21.90acid regurgitation2.51.91.3constipation1.30.60melena1.31.30nausea0.61.20.6diarrhea001.3Nervous System/Psychiatricheadache0.601.3The overall safety and tolerability profile in the glucocorticoid-induced osteoporosis population that continued therapy for the second year of the studies (alendronate sodium: n=147) was consistent with that observed in the first year.Pagets Disease of BoneIn clinical studies (osteoporosis and Pagets disease), adverse events reported in 175 patients taking alendronate 40 mg/day for to 12 months were similar to those in postmenopausal women treated with alendronate 10 mg/day. However, there was an apparent increased incidence of upper gastrointestinal adverse reactions in patients taking alendronate 40 mg/day (17.7% alendronate vs. 10.2% placebo). One case of esophagitis and two cases of gastritis resulted in discontinuation of treatment.Additionally, musculoskeletal (bone, muscle or joint) pain, which has been described in patients with Pagets disease treated with other bisphosphonates, was considered by the investigators as possibly, probably, or definitely drug related in approximately 6% of patients treated with alendronate 40 mg/day versus approximately 1% of patients treated with placebo, but rarely resulted in discontinuation of therapy. Discontinuation of therapy due to any clinical adverse events occurred in 6.4% of patients with Pagets disease treated with alendronate 40 mg/day and 2.4% of patients treated with placebo.

DOSAGE & ADMINISTRATION SECTION.

2 DOSAGE AND ADMINISTRATION. Treatment of osteoporosis in postmenopausal women and in men: 10 mg daily or 70 mg tablet once weekly. 2.1, 2.3) Prevention of osteoporosis in postmenopausal women: mg daily or 35 mg once weekly. 2.2) Glucocorticoid-induced osteoporosis: mg daily; or 10 mg daily in postmenopausal women not receiving estrogen. 2.4) Pagets disease: 40 mg daily for six months. 2.5) Instruct patients to: 2.6) Swallow tablets whole with to ounces plain water at least 30 minutes before the first food, drink, or medication of the day.Not lie down for at least 30 minutes after taking alendronate sodium tablets and until after food.. Swallow tablets whole with to ounces plain water at least 30 minutes before the first food, drink, or medication of the day.. Not lie down for at least 30 minutes after taking alendronate sodium tablets and until after food. 2.1 Treatment of Osteoporosis in Postmenopausal Women. The recommended dosage is:one 70 mg tablet once weeklyorone 10 mg tablet once daily. one 70 mg tablet once weekly. one 10 mg tablet once daily. 2.2 Prevention of Osteoporosis in Postmenopausal Women. The recommended dosage is:one 35 mg tablet once weeklyorone mg tablet once daily. one 35 mg tablet once weekly. one mg tablet once daily. 2.3 Treatment to Increase Bone Mass in Men with Osteoporosis. The recommended dosage is:one 70 mg tablet once weeklyorone 10 mg tablet once daily. one 70 mg tablet once weekly. one 10 mg tablet once daily. 2.4 Treatment of Glucocorticoid-Induced Osteoporosis. The recommended dosage is one mg tablet once daily, except for postmenopausal women not receiving estrogen, for whom the recommended dosage is one 10 mg tablet once daily.. 2.5 Treatment of Pagets Disease of Bone. The recommended treatment regimen is 40mg once day for six months.Re-treatment of Pagets DiseaseRe-treatment with alendronate sodium tablets may be considered, following six-month post-treatment evaluation period in patients who have relapsed, based on increases in serum alkaline phosphatase, which should be measured periodically. Re-treatment may also be considered in those who failed to normalize their serum alkaline phosphatase.. 2.6 Important Administration Instructions. Instruct patients to do the following:Take alendronate sodium tablets at least one-half hour before the first food, beverage, or medication of the day with plain water only [see Patient Counseling Information 17.2 )]. Other beverages (including mineral water), food, and some medications are likely to reduce the absorption of alendronate sodium tablets [see Drug Interactions 7.1 ]. Waiting less than 30 minutes, or taking alendronate sodium tablets with food, beverages (other than plain water) or other medications will lessen the effect of alendronate sodium tablets by decreasing its absorption into the body. Take alendronate sodium tablets upon arising for the day. To facilitate delivery to the stomach and thus reduce the potential for esophageal irritation, an alendronate sodium tablet should be swallowed with full glass of water (6 to ounces). Patients should not lie down for at least 30 minutes and until after their first food of the day. Alendronate sodium tablets should not be taken at bedtime or before arising for the day. Failure to follow these instructions may increase the risk of esophageal adverse experiences [see Warnings and Precautions 5.1 and Patient Counseling Information 17.2 )]. Take alendronate sodium tablets at least one-half hour before the first food, beverage, or medication of the day with plain water only [see Patient Counseling Information 17.2 )]. Other beverages (including mineral water), food, and some medications are likely to reduce the absorption of alendronate sodium tablets [see Drug Interactions 7.1 ]. Waiting less than 30 minutes, or taking alendronate sodium tablets with food, beverages (other than plain water) or other medications will lessen the effect of alendronate sodium tablets by decreasing its absorption into the body. Take alendronate sodium tablets upon arising for the day. To facilitate delivery to the stomach and thus reduce the potential for esophageal irritation, an alendronate sodium tablet should be swallowed with full glass of water (6 to ounces). Patients should not lie down for at least 30 minutes and until after their first food of the day. Alendronate sodium tablets should not be taken at bedtime or before arising for the day. Failure to follow these instructions may increase the risk of esophageal adverse experiences [see Warnings and Precautions 5.1 and Patient Counseling Information 17.2 )]. 2.7 Recommendations for Calcium and Vitamin Supplementation. Instruct patients to take supplemental calcium if dietary intake is inadequate [see Warnings and Precautions 5.2 )]. Patients at increased risk for vitamin insufficiency (e.g., over the age of 70 years, nursing home-bound, or chronically ill) may need vitamin supplementation. Patients with gastrointestinal malabsorption syndromes may require higher doses of vitamin supplementation and measurement of 25-hydroxyvitamin should be considered. Patients treated with glucocorticoids should receive adequate amounts of calcium and vitamin D.. 2.8 Administration Instructions for Missed Doses. If once-weekly dose of alendronate sodium tablets is missed, instruct patients to take one dose on the morning after they remember. They should not take two doses on the same day but should return to taking one dose once week, as originally scheduled on their chosen day.

PHARMACODYNAMICS SECTION.

12.2 Pharmacodynamics. Alendronate is bisphosphonate that binds to bone hydroxyapatite and specifically inhibits the activity of osteoclasts, the bone-resorbing cells. Alendronate reduces bone resorption with no direct effect on bone formation, although the latter process is ultimately reduced because bone resorption and formation are coupled during bone turnover.Osteoporosis in Postmenopausal WomenOsteoporosis is characterized by low bone mass that leads to an increased risk of fracture. The diagnosis can be confirmed by the finding of low bone mass, evidence of fracture on x-ray, history of osteoporotic fracture, or height loss or kyphosis, indicative of vertebral (spinal) fracture. Osteoporosis occurs in both males and females but is most common among women following the menopause, when bone turnover increases and the rate of bone resorption exceeds that of bone formation. These changes result in progressive bone loss and lead to osteoporosis in significant proportion of women over age 50. Fractures, usually of the spine, hip, and wrist, are the common consequences. From age 50 to age 90, the risk of hip fracture in white women increases 50-fold and the risk of vertebral fracture 15- to 30-fold. It is estimated that approximately 40% of 50-year-old women will sustain one or more osteoporosis-related fractures of the spine, hip, or wrist during their remaining lifetimes. Hip fractures, in particular, are associated with substantial morbidity, disability, and mortality.Daily oral doses of alendronate (5, 20, and 40 mg for six weeks) in postmenopausal women produced biochemical changes indicative of dose-dependent inhibition of bone resorption, including decreases in urinary calcium and urinary markers of bone collagen degradation (such as deoxypyridinoline and cross-linked N-telopeptides of type collagen). These biochemical changes tended to return toward baseline values as early as weeks following the discontinuation of therapy with alendronate and did not differ from placebo after months.Long-term treatment of osteoporosis with alendronate 10 mg/day (for up to five years) reduced urinary excretion of markers of bone resorption, deoxypyridinoline and cross-linked N-telopeptides of type collagen, by approximately 50% and 70%, respectively, to reach levels similar to those seen in healthy premenopausal women. Similar decreases were seen in patients in osteoporosis prevention studies who received alendronate mg/day. The decrease in the rate of bone resorption indicated by these markers was evident as early as one month and at three to six months reached plateau that was maintained for the entire duration of treatment with alendronate sodium. In osteoporosis treatment studies alendronate 10 mg/day decreased the markers of bone formation, osteocalcin and bone specific alkaline phosphatase by approximately 50%, and total serum alkaline phosphatase by approximately 25 to 30% to reach plateau after to 12 months. In osteoporosis prevention studies alendronate mg/day decreased osteocalcin and total serum alkaline phosphatase by approximately 40% and 15%, respectively. Similar reductions in the rate of bone turnover were observed in postmenopausal women during one-year studies with once weekly alendronate 70 mg for the treatment of osteoporosis and once weekly alendronate 35 mg for the prevention of osteoporosis. These data indicate that the rate of bone turnover reached new steady- state, despite the progressive increase in the total amount of alendronate deposited within bone.As result of inhibition of bone resorption, asymptomatic reductions in serum calcium and phosphate concentrations were also observed following treatment with alendronate sodium. In the long-term studies, reductions from baseline in serum calcium (approximately 2%) and phosphate (approximately to 6%) were evident the first month after the initiation of alendronate 10 mg. No further decreases in serum calcium were observed for the five-year duration of treatment; however, serum phosphate returned toward prestudy levels during years three through five. Similar reductions were observed with alendronate mg/day. In one-year studies with once weekly alendronate 35 and 70 mg, similar reductions were observed at and 12 months. The reduction in serum phosphate may reflect not only the positive bone mineral balance due to alendronate sodium but also decrease in renal phosphate reabsorption.Osteoporosis in MenTreatment of men with osteoporosis with alendronate 10 mg/day for two years reduced urinary excretion of cross-linked N-telopeptides of type collagen by approximately 60% and bone-specific alkaline phosphatase by approximately 40%. Similar reductions were observed in one-year study in men with osteoporosis receiving once weekly alendronate 70 mg.Glucocorticoid-Induced OsteoporosisSustained use of glucocorticoids is commonly associated with development of osteoporosis and resulting fractures (especially vertebral, hip, and rib). It occurs in both males and females of all ages. Osteoporosis occurs as result of inhibited bone formation and increased bone resorption resulting in net bone loss. Alendronate decreases bone resorption without directly inhibiting bone formation.In clinical studies of up to two years duration, alendronate and 10 mg/day reduced cross-linked N- telopeptides of type collagen (a marker of bone resorption) by approximately 60% and reduced bone- specific alkaline phosphatase and total serum alkaline phosphatase (markers of bone formation) by approximately 15 to 30% and to 18%, respectively. As result of inhibition of bone resorption, alendronate and 10 mg/day induced asymptomatic decreases in serum calcium (approximately to 2%) and serum phosphate (approximately to 8%).Pagets Disease of BonePagets disease of bone is chronic, focal skeletal disorder characterized by greatly increased and disorderly bone remodeling. Excessive osteoclastic bone resorption is followed by osteoblastic new bone formation, leading to the replacement of the normal bone architecture by disorganized, enlarged, and weakened bone structure.Clinical manifestations of Pagets disease range from no symptoms to severe morbidity due to bone pain, bone deformity, pathological fractures, and neurological and other complications. Serum alkaline phosphatase, the most frequently used biochemical index of disease activity, provides an objective measure of disease severity and response to therapy.Alendronate sodium decreases the rate of bone resorption directly, which leads to an indirect decrease in bone formation. In clinical trials, alendronate 40 mg once daily for six months produced significant decreases in serum alkaline phosphatase as well as in urinary markers of bone collagen degradation. As result of the inhibition of bone resorption, alendronate sodium induced generally mild, transient, and asymptomatic decreases in serum calcium and phosphate.

PHARMACOKINETICS SECTION.

12.3 Pharmacokinetics. AbsorptionRelative to an intravenous reference dose, the mean oral bioavailability of alendronate in women was 0.64% for doses ranging from to 70 mg when administered after an overnight fast and two hours before standardized breakfast. Oral bioavailability of the 10 mg tablet in men (0.59%) was similar to that in women when administered after an overnight fast and hours before breakfast.Alendronate 70 mg oral solution and alendronate 70 mg tablet are equally bioavailable.A study examining the effect of timing of meal on the bioavailability of alendronate was performed in 49 postmenopausal women. Bioavailability was decreased (by approximately 40%) when 10 mg alendronate was administered either 0.5 or hour before standardized breakfast, when compared to dosing hours before eating. In studies of treatment and prevention of osteoporosis, alendronate was effective when administered at least 30 minutes before breakfast.Bioavailability was negligible whether alendronate was administered with or up to two hours after standardized breakfast. Concomitant administration of alendronate with coffee or orange juice reduced bioavailability by approximately 60%.DistributionPreclinical studies (in male rats) show that alendronate transiently distributes to soft tissues following mg/kg intravenous administration but is then rapidly redistributed to bone or excreted in the urine. The mean steady-state volume of distribution, exclusive of bone, is at least 28 in humans. Concentrationsof drug in plasma following therapeutic oral doses are too low (less than ng/mL) for analytical detection. Protein binding in human plasma is approximately 78%.MetabolismThere is no evidence that alendronate is metabolized in animals or humans.ExcretionFollowing single intravenous dose of 14C] alendronate, approximately 50% of the radioactivity was excreted in the urine within 72 hours and little or no radioactivity was recovered in the feces. Following single 10 mg intravenous dose, the renal clearance of alendronate was 71 mL/min (64, 78; 90% confidence interval [CI]), and systemic clearance did not exceed 200 mL/min. Plasma concentrations fell by more than 95% within hours following intravenous administration. The terminal half-life in humans is estimated to exceed 10 years, probably reflecting release of alendronate from the skeleton. Based on the above, it is estimated that after 10 years of oral treatment with alendronate (10 mg daily) the amount of alendronate released daily from the skeleton is approximately 25% of that absorbed from the gastrointestinal tract.Specific PopulationsGender: Bioavailability and the fraction of an intravenous dose excreted in urine were similar in men and women. Geriatric: Bioavailability and disposition (urinary excretion) were similar in elderly and younger patients. No dosage adjustment is necessary in elderly patients. Race: Pharmacokinetic differences due to race have not been studied. Renal Impairment: Preclinical studies show that, in rats with kidney failure, increasing amounts of drug are present in plasma, kidney, spleen, and tibia. In healthy controls, drug that is not deposited in bone is rapidly excreted in the urine. No evidence of saturation of bone uptake was found after weeks dosing with cumulative intravenous doses of 35 mg/kg in young male rats. Although no formal renal impairment pharmacokinetic study has been conducted in patients, it is likely that, as in animals, elimination of alendronate via the kidney will be reduced in patients with impaired renal function. Therefore, somewhat greater accumulation of alendronate in bone might be expected in patients with impaired renal function. No dosage adjustment is necessary for patients with creatinine clearance 35 to 60 mL/min. Alendronate sodium is not recommended for patients with creatinine clearance less than 35 mL/min due to lack of experience with alendronate in renal failure.Hepatic Impairment: As there is evidence that alendronate is not metabolized or excreted in the bile, no studies were conducted in patients with hepatic impairment. No dosage adjustment is necessary. Drug InteractionsIntravenous ranitidine was shown to double the bioavailability of oral alendronate. The clinical significance of this increased bioavailability and whether similar increases will occur in patients given oral H2-antagonists is unknown.In healthy subjects, oral prednisone (20 mg three times daily for five days) did not produce clinically meaningful change in the oral bioavailability of alendronate (a mean increase ranging from 20 to 44%).Products containing calcium and other multivalent cations are likely to interfere with absorption of alendronate.

SPL MEDGUIDE SECTION.

MEDICATION GUIDE. Alendronate Sodium Tablets, USPRead the Medication Guide that comes with alendronate sodium tablets before you start taking them and each time you get refill. There may be new information. This Medication Guide does not take the place of talking with your doctor about your medical condition or treatment. Talk to your doctor if you have any questions about alendronate sodium tablets.What is the most important information should know about alendronate sodium tablets Alendronate sodium tablets can cause serious side effects including:1. Esophagus problems 2. Low calcium levels in your blood (hypocalcemia) 3. Bone, joint, or muscle pain 4. Severe jaw bone problems (osteonecrosis) 5. Unusual thigh bone fractures 1.Esophagus problems.Some people who take alendronate sodium tablets may develop problems in the esophagus (the tube that connects the mouth and the stomach). These problems include irritation, inflammation, or ulcers of the esophagus which may sometimes bleed.It is important that you take alendronate sodium tablets exactly as prescribed to help lower your chance of getting esophagus problems. (See the section How should take alendronate sodium tablets)Stop taking alendronate sodium tablets and call your doctor right away if you get chest pain, new or worsening heartburn, or have trouble or pain when you swallow.2. Low calcium levels in your blood (hypocalcemia).Alendronate sodium tablets may lower the calcium levels in your blood. If you have low blood calcium before you start taking alendronate sodium tablets, they may get worse during treatment. Your low blood calcium must be treated before you take alendronate sodium tablets. Most people with low blood calcium levels do not have symptoms, but some people may have symptoms. Call your doctor right away if you have symptoms of low blood calcium such as:Spasms, twitches, or cramps in your musclesNumbness or tingling in your fingers, toes, or around your mouthYour doctor may prescribe calcium and vitamin to help prevent low calcium levels in your blood, while you take alendronate sodium tablets. Take calcium and vitamin as your doctor tells you to.3. Bone, joint, or muscle pain.Some people who take alendronate sodium tablets develop severe bone, joint, or muscle pain.4.Severe jawbone problems (osteonecrosis).Severe jawbone problems may happen when you take alendronate sodium tablets. Your doctor should examine your mouth before you start alendronate sodium tablets. Your doctor may tell you to see your dentist before you start alendronate sodium tablets. It is important for you to practice good mouth care during treatment with alendronate sodium tablets.5.Unusual thigh bone fractures.Some people have developed unusual fractures in their thigh bone. Symptoms of fracture may include new or unusual pain in your hip, groin, or thigh.Call your doctor right away if you have any of these side effects. What are alendronate sodium tabletsAlendronate sodium tablets are prescription medicine used to:Treat or prevent osteoporosis in women after menopause. It helps reduce the chance of having hip or spinal fracture (break).Increase bone mass in men with osteoporosis.Treat osteoporosis in either men or women who are taking corticosteroid medicines.Treat certain men and women who have Pagets disease of the bone.It is not known how long alendronate sodium tablets work for the treatment and prevention of osteoporosis. You should see your doctor regularly to determine if alendronate sodium tablets are still right for you.Alendronate sodium tablets are not for use in children.Who should not take alendronate sodium tabletsDo not take alendronate sodium tablets if you:Have certain problems with your esophagus, the tube that connects your mouth with your stomachCannot stand or sit upright for at least 30 minutesHave low levels of calcium in your bloodAre allergic to alendronate sodium tablets or any of their ingredients. list of ingredients is at the end of this leaflet.What should tell my doctor before taking alendronate sodium tabletsBefore you tart alendronate sodium tablets, be sure to talk to your doctor if you:Have problems with swallowingHave stomach or digestive problemsHave low blood calciumPlan to have dental surgery or teeth removedHave kidney problemsHave been told you have trouble absorbing minerals in your stomach or intestines (malabsorption syndrome)Are pregnant, trying to become pregnant or suspect that you are pregnant. If you become pregnant while taking alendronate sodium tablets, stop taking them and contact your doctor. It is not known if alendronate sodium tablets can harm your unborn baby. Are breast-feeding or plan to breast-feed. It is not known if alendronate sodium passes into your milk and may harm your baby.Especially tell your doctor if you take:antacidsaspirinNonsteroidal Anti-Inflammatory (NSAID) medicinesTell your doctor about all the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements. Certain medicines may affect how alendronate sodium tablets work. Know the medicines you take. Keep list of them and show it to your doctor and pharmacist each time you get new medicine.How should take alendronate sodium tabletsTake alendronate sodium tablets exactly as your doctor tells you.Alendronate sodium tablets work only if taken on an empty stomach.Take alendronate sodium tablets, after you get up for the day and before taking your first food, drink, or other medicine.Take alendronate sodium tablets while you are sitting or standing.Do not chew or suck on tablet of alendronate sodium.Swallow alendronate sodium tablet with full glass (6 to oz) of plain water only.Do not take alendronate sodium tablets with mineral water, coffee, tea, soda, or juice.If you take Alendronate Daily: Take alendronate tablet one time day, every day after you get up for the day and before taking your first food, drink, or other medicine. If you take Once Weekly alendronate sodium tablets: Choose the day of the week that best fits your schedule. Take dose of alendronate sodium tablet every week on your chosen day after you get up for the day and before taking your first food, drink, or other medicine. After swallowing alendronate sodium tablet, wait at least 30 minutes:Before you lie down. You may sit, stand or walk, and do normal activities like reading.Before you take your first food or drink except for plain water.Before you take other medicines, including antacids, calcium, and other supplements and vitamins.Do not lie down for at least 30 minutes after you take alendronate sodium tablets and after you eat your first food of the day.If you miss dose of alendronate sodium tablets, do not take it later in the day. Take your missed dose on the next morning after you remember and then return to your normal schedule. Do not take doses on the same day.If you take too much alendronate sodium, call your doctor. Do not try to vomit. Do not lie down.What are the possible side effects of alendronate sodium tabletsAlendronate sodium tablets may cause serious side effects.See What is the most important information should know about alendronate sodium tablets The most common side effects of alendronate sodium tablets are:Stomach area (abdominal) pain HeartburnConstipation Diarrhea Upset stomachPain in your bones, joints, or muscles NauseaYou may get allergic reactions, such as hives or swelling of your face, lips, tongue, or throat.Worsening of asthma has been reported.Tell your doctor if you have any side effect that bothers you or that does not go away.These are not all the possible side effects of alendronate sodium tablets. For more information, ask your doctor or pharmacist.Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800- FDA-1088.How do store alendronate sodium tabletsStore at room temperature, 20 to 25C (68 to 77F). Excursions permitted to 15- 30C (59 86F).Keep alendronate sodium tablets in tightly closed container.Keep alendronate sodium tablets and all medicines out of the reach of children. General information about the safe and effective use of alendronate sodium tablets.Medicines are sometimes prescribed for purposes other than those listed in Medication Guide. Do not use alendronate sodium tablets for condition for which it was not prescribed. Do not give alendronate sodium tablets to other people, even if they have the same symptoms you have. They may harm them.This Medication Guide summarizes the most important information about alendronate sodium tablets. If you would like more information, talk with your doctor. You can ask your doctor or pharmacist for information about alendronate sodium tablets that is written for health professionals.For more information, call 1-888-848-3593.What are the ingredients in alendronate sodium tabletsActive ingredient: alendronate SodiumInactive ingredients: Microcrystalline cellulose, Croscarmellose sodium, and Magnesium stearate.This Medication Guide has been approved by the U.S. Food and Drug Administration.Rx OnlyDistributed by:Marlex Pharmaceuticals, Inc.New Castle, DE 19720Made in USARev. 12/2020. It is important that you take alendronate sodium tablets exactly as prescribed to help lower your chance of getting esophagus problems. (See the section How should take alendronate sodium tablets). Stop taking alendronate sodium tablets and call your doctor right away if you get chest pain, new or worsening heartburn, or have trouble or pain when you swallow.. Spasms, twitches, or cramps in your muscles. Numbness or tingling in your fingers, toes, or around your mouth. Treat or prevent osteoporosis in women after menopause. It helps reduce the chance of having hip or spinal fracture (break).. Increase bone mass in men with osteoporosis.. Treat osteoporosis in either men or women who are taking corticosteroid medicines.. Treat certain men and women who have Pagets disease of the bone.. Have certain problems with your esophagus, the tube that connects your mouth with your stomach. Cannot stand or sit upright for at least 30 minutes. Have low levels of calcium in your blood. Are allergic to alendronate sodium tablets or any of their ingredients. list of ingredients is at the end of this leaflet.. Have problems with swallowing. Have stomach or digestive problems. Have low blood calcium. Plan to have dental surgery or teeth removed. Have kidney problems. Have been told you have trouble absorbing minerals in your stomach or intestines (malabsorption syndrome). Are pregnant, trying to become pregnant or suspect that you are pregnant. If you become pregnant while taking alendronate sodium tablets, stop taking them and contact your doctor. It is not known if alendronate sodium tablets can harm your unborn baby. Are breast-feeding or plan to breast-feed. It is not known if alendronate sodium passes into your milk and may harm your baby.. antacids. aspirin. Nonsteroidal Anti-Inflammatory (NSAID) medicines. Take alendronate sodium tablets exactly as your doctor tells you.. Alendronate sodium tablets work only if taken on an empty stomach.. Take alendronate sodium tablets, after you get up for the day and before taking your first food, drink, or other medicine.. Take alendronate sodium tablets while you are sitting or standing.. Do not chew or suck on tablet of alendronate sodium.. Swallow alendronate sodium tablet with full glass (6 to oz) of plain water only.. Do not take alendronate sodium tablets with mineral water, coffee, tea, soda, or juice.. If you take Alendronate Daily: Take alendronate tablet one time day, every day after you get up for the day and before taking your first food, drink, or other medicine. If you take Once Weekly alendronate sodium tablets: Choose the day of the week that best fits your schedule. Before you lie down. You may sit, stand or walk, and do normal activities like reading.. Before you take your first food or drink except for plain water.. Before you take other medicines, including antacids, calcium, and other supplements and vitamins.. See What is the most important information should know about alendronate sodium tablets Stomach area (abdominal) pain Heartburn. Constipation Diarrhea Upset stomach. Pain in your bones, joints, or muscles Nausea. You may get allergic reactions, such as hives or swelling of your face, lips, tongue, or throat.. Worsening of asthma has been reported.. Tell your doctor if you have any side effect that bothers you or that does not go away.. Store at room temperature, 20 to 25C (68 to 77F). Excursions permitted to 15- 30C (59 86F).. Keep alendronate sodium tablets in tightly closed container.

USE IN SPECIFIC POPULATIONS SECTION.

8 USE IN SPECIFIC POPULATIONS Pregnancy: Discontinue when pregnancy is recognized. 8.1) Alendronate sodium is not indicated for use in pediatric patients. 8.4) Alendronate sodium is not recommended in patients with renal impairment (creatinine clearance less than 35 mL/min). 5.6, 8.6) See 17 for PATIENT COUNSELING INFORMATION and Medication Guide.Revised: 12/2020. Pregnancy: Discontinue when pregnancy is recognized. 8.1) Alendronate sodium is not indicated for use in pediatric patients. 8.4) Alendronate sodium is not recommended in patients with renal impairment (creatinine clearance less than 35 mL/min). 5.6, 8.6) 8.1 Pregnancy. Risk SummaryAvailable data on the use of alendronate sodium in pregnant women are insufficient to inform drug- associated risk of adverse maternal or fetal outcomes. Discontinue alendronate sodium when pregnancy is recognized.In animal reproduction studies, daily oral administration of alendronate to rats from before mating through the end of gestation or lactation showed decreased postimplantation survival and decreased pup body weight gain starting at doses equivalent to less than half of the highest recommended 40 mg clinical daily dose (based on body surface area, mg/m 2). Oral administration of alendronate to rats during organogenesis resulted in reduced fetal ossification starting at doses times the 40 mg clinical daily dose. No similar fetal effects were observed in pregnant rabbits dosed orally during organogenesis at doses equivalent to approximately 10 times the 40 mg clinical daily dose. Delayed or failed delivery of offspring, protracted parturition, and late pregnancy maternal and fetal deaths due to maternal hypocalcemia occurred in rats at oral doses as low as one tenth the 40 mg clinical daily dose (see Data). Bisphosphonates are incorporated into the bone matrix, from which they are gradually released over aperiod of years. The amount of bisphosphonate incorporated into adult bone and available for release into the systemic circulation is directly related to the dose and duration of bisphosphonate use.Consequently, based on the mechanism of action of bisphosphonates, there is potential risk of fetal harm, predominantly skeletal, if woman becomes pregnant after completing course of bisphosphonate therapy. The impact of variables such as time between cessation of bisphosphonate therapy to conception, the particular bisphosphonate used, and the route of administration (intravenous versus oral) on the risk has not been studied.The estimated background risk of major birth defects and miscarriage for the indicated population(s) is unknown. All pregnancies have background risk of birth defects, loss, or other adverse outcomes. In the U.S. general population, the estimated background risks of major birth defects and miscarriage in clinically recognized pregnancies is to 4% and 15 to 20%, respectively.DataAnimal DataReproduction studies in rats dosed orally from before mating to the end of gestation or lactation showed decreased postimplantation survival starting at mg/kg/day and decreased body weight gain starting at mg/kg/day, doses equivalent to less than half the 40 mg clinical daily dose based on body surface area, mg/m 2. Incidence of incomplete fetal ossification in vertebral, skull, and sternebral bones were increased in rats dosed orally during organogenesis starting at 10 mg/kg/day (approximately times the 40 mg clinical daily dose). No similar fetal effects were observed in pregnant rabbits dosed orally during organogenesis at up to 35 mg/kg/day (equivalent to approximately 10 times the 40 mg clinical daily dose). Both total and ionized calcium decreased in pregnant rats dosed orally with 15 mg/kg/day alendronate (approximately times the 40 mg clinical daily dose) resulting in delays and failures of delivery. Protracted parturition due to maternal hypocalcemia was observed when rats were treated from before mating through gestation starting at 0.5 mg/kg/day (approximately one tenth the 40 mg clinical daily dose). Maternotoxicity (late pregnancy deaths) also occurred in female rats treated orally with 15 mg/kg/day (approximately times the 40 mg clinical daily dose) for varying gestational time periods. These maternal deaths were lessened but not eliminated by cessation of treatment. Calcium supplementation in the drinking water or by subcutaneous minipump to rats dosed orally with 15 mg/kg/day alendronate could not ameliorate the hypocalcemia or prevent the dystocia-related maternal and neonatal deaths. However, intravenous calcium supplementation prevented maternal, but not neonatal deaths.. 8.2 Lactation. Risk SummaryIt is not known whether alendronate is present in human breast milk, affects human milk production, or has effects on the breastfed infant. The developmental and health benefits of breastfeeding should be considered along with the mothers clinical need for alendronate sodium and any potential adverse effects on the breastfed child from alendronate sodium or from the underlying maternal condition.. 8.4 Pediatric Use. Alendronate sodium is not indicated for use in pediatric patients.The safety and efficacy of alendronate sodium were examined in randomized, double-blind, placebo- controlled two-year study of 139 pediatric patients, aged to 18 years, with severe osteogenesis imperfecta (OI). One-hundred-and-nine patients were randomized to mg alendronate daily (weight less than 40 kg) or 10 mg alendronate daily (weight greater than or equal to 40 kg) and 30 patients to placebo. The mean baseline lumbar spine BMD Z-score of the patients was -4.5. The mean change in lumbar spine BMD Z-score from baseline to Month 24 was 1.3 in the alendronate sodium-treated patients and 0.1 in the placebo-treated patients. Treatment with alendronate sodium did not reduce the risk of fracture. Sixteen percent of the alendronate sodium patients who sustained radiologically- confirmed fracture by Month 12 of the study had delayed fracture healing (callus remodeling) or fracture non-union when assessed radiographically at Month 24 compared with 9% of the placebo- treated patients. In alendronate sodium-treated patients, bone histomorphometry data obtained at Month 24 demonstrated decreased bone turnover and delayed mineralization time; however, there were no mineralization defects. There were no statistically significant differences between the alendronate sodium and placebo groups in reduction of bone pain. The oral bioavailability in children was similar to that observed in adults.The overall safety profile of alendronate sodium in osteogenesis imperfecta patients treated for up to 24 months was generally similar to that of adults with osteoporosis treated with alendronate sodium. However, there was an increased occurrence of vomiting in osteogenesis imperfecta patients treated with alendronate sodium compared to placebo. During the 24-month treatment period, vomiting was observed in 32 of 109 (29.4%) patients treated with alendronate sodium and of 30 (10%) patients treated with placebo.In pharmacokinetic study, of 24 pediatric osteogenesis imperfecta patients who received single oral dose of alendronate 35 or 70 mg developed fever, flu-like symptoms, and/or mild lymphocytopenia within 24 to 48 hours after administration. These events, lasting no more than to days and responding to acetaminophen, are consistent with an acute-phase response that has been reported in patients receiving bisphosphonates, including alendronate sodium. [See Adverse Reactions 6.2 ).] 8.5 Geriatric Use. Of the patients receiving alendronate sodium in the Fracture Intervention Trial (FIT), 71% (n=2302) were greater than or equal to 65 years of age and 17% (n=550) were greater than or equal to 75 years of age. Of the patients receiving alendronate sodium in the United States and Multinational osteoporosis treatment studies in women, osteoporosis studies in men, glucocorticoid-induced osteoporosis studies, and Pagets disease studies [see Clinical Studies 14.1 ), 14.3 ), 14.4 ), 14.5 )], 45%, 54%, 37%, and 70%, respectively, were 65 years of age or over. No overall differences in efficacy or safety were observed between these patients and younger patients, but greater sensitivity of some older individuals cannot be ruled out. 8.6 Renal Impairment. Alendronate sodium is not recommended for patients with creatinine clearance less than 35 mL/min. No dosage adjustment is necessary in patients with creatinine clearance values between 35 to 60 mL/min see Clinical Pharmacology 12.3 )]. 8.7 Hepatic Impairment. As there is evidence that alendronate is not metabolized or excreted in the bile, no studies were conducted in patients with hepatic impairment. No dosage adjustment is necessary [see Clinical Pharmacology 12.3 )].

WARNINGS AND PRECAUTIONS SECTION.

5 WARNINGS AND PRECAUTIONS Upper Gastrointestinal Adverse Reactions can occur. Instruct patients to follow dosing instructions. Discontinue if new or worsening symptoms occur. 5.1) Hypocalcemia can worsen and must be corrected prior to use. 5.2) Severe Bone, Joint, Muscle Pain may occur. Discontinue use if severe symptoms develop. 5.3) Osteonecrosis of the Jaw has been reported. 5.4) Atypical Femur Fractures have been reported. Patients with new thigh or groin pain should be evaluated to rule out an incomplete femoral fracture. 5.5) Upper Gastrointestinal Adverse Reactions can occur. Instruct patients to follow dosing instructions. Discontinue if new or worsening symptoms occur. 5.1) Hypocalcemia can worsen and must be corrected prior to use. 5.2) Severe Bone, Joint, Muscle Pain may occur. Discontinue use if severe symptoms develop. 5.3) Osteonecrosis of the Jaw has been reported. 5.4) Atypical Femur Fractures have been reported. Patients with new thigh or groin pain should be evaluated to rule out an incomplete femoral fracture. 5.5) 5.1 Upper Gastrointestinal Adverse Reactions. Alendronate sodium, like other bisphosphonates administered orally, may cause local irritation of the upper gastrointestinal mucosa. Because of these possible irritant effects and potential for worsening of the underlying disease, caution should be used when alendronate sodium is given to patients with active upper gastrointestinal problems (such as known Barretts esophagus, dysphagia, other esophageal diseases, gastritis, duodenitis, or ulcers).Esophageal adverse experiences, such as esophagitis, esophageal ulcers and esophageal erosions, occasionally with bleeding and rarely followed by esophageal stricture or perforation, have been reported in patients receiving treatment with oral bisphosphonates including alendronate sodium. In some cases these have been severe and required hospitalization. Physicians should therefore be alert to any signs or symptoms signaling possible esophageal reaction and patients should be instructed to discontinue alendronate sodium and seek medical attention if they develop dysphagia, odynophagia, retrosternal pain or new or worsening heartburn.The risk of severe esophageal adverse experiences appears to be greater in patients who lie down after taking oral bisphosphonates including alendronate sodium and/or who fail to swallow oralbisphosphonates including alendronate sodium with the recommended full glass (6 to ounces) of water, and/or who continue to take oral bisphosphonates including alendronate sodium after developing symptoms suggestive of esophageal irritation. Therefore, it is very important that the full dosing instructions are provided to, and understood by, the patient [see Dosage and Administration 2.6 )]. In patients who cannot comply with dosing instructions due to mental disability, therapy with alendronate sodium should be used under appropriate supervision. There have been post-marketing reports of gastric and duodenal ulcers with oral bisphosphonate use, some severe and with complications, although no increased risk was observed in controlled clinical trials [see Adverse Reactions 6.2 )]. 5.2 Mineral Metabolism. Hypocalcemia must be corrected before initiating therapy with alendronate sodium [see Contraindications 4 )]. Other disorders affecting mineral metabolism (such as vitamin deficiency) should also be effectively treated. In patients with these conditions, serum calcium and symptoms of hypocalcemia should be monitored during therapy with alendronate sodium. Presumably due to the effects of alendronate sodium on increasing bone mineral, small, asymptomatic decreases in serum calcium and phosphate may occur, especially in patients with Pagets disease, in whom the pretreatment rate of bone turnover may be greatly elevated, and in patients receiving glucocorticoids, in whom calcium absorption may be decreased.Ensuring adequate calcium and vitamin intake is especially important in patients with Pagets disease of bone and in patients receiving glucocorticoids.. 5.3 Musculoskeletal Pain. In post-marketing experience, severe and occasionally incapacitating bone, joint, and/or muscle pain has been reported in patients taking bisphosphonates that are approved for the prevention and treatment of osteoporosis [see Adverse Reactions 6.2 )]. This category of drugs includes alendronate sodium. Most of the patients were postmenopausal women. The time to onset of symptoms varied from one day to several months after starting the drug. Discontinue use if severe symptoms develop. Most patients had relief of symptoms after stopping. subset had recurrence of symptoms when rechallenged with the same drug or another bisphosphonate. In placebo-controlled clinical studies of alendronate sodium, the percentages of patients with these symptoms were similar in the alendronate sodium and placebo groups.. 5.4 Osteonecrosis of the Jaw. Osteonecrosis of the jaw (ONJ), which can occur spontaneously, is generally associated with tooth extraction and/or local infection with delayed healing, and has been reported in patients taking bisphosphonates, including alendronate sodium. Known risk factors for osteonecrosis of the jaw include invasive dental procedures (e.g., tooth extraction, dental implants, boney surgery), diagnosis of cancer, concomitant therapies (e.g., chemotherapy, corticosteroids, angiogenesis inhibitors), poor oral hygiene, and co-morbid disorders (e.g., periodontal and/or other pre-existing dental disease, anemia, coagulopathy, infection, ill-fitting dentures). The risk of ONJ may increase with duration of exposure to bisphosphonates.For patients requiring invasive dental procedures, discontinuation of bisphosphonate treatment may reduce the risk for ONJ. Clinical judgment of the treating physician and/or oral surgeon should guide the management plan of each patient based on individual benefit/risk assessment.Patients who develop osteonecrosis of the jaw while on bisphosphonate therapy should receive care by an oral surgeon. In these patients, extensive dental surgery to treat ONJ may exacerbate the condition.Discontinuation of bisphosphonate therapy should be considered based on individual benefit/risk assessment.. 5.5 Atypical Subtrochanteric and Diaphyseal Femoral Fractures. Atypical, low-energy, or low trauma fractures of the femoral shaft have been reported in bisphosphonate-treated patients. These fractures can occur anywhere in the femoral shaft from just below the lesser trochanter to above the supracondylar flare and are transverse or short oblique in orientation without evidence of comminution. Causality has not been established as these fractures also occur in osteoporotic patients who have not been treated with bisphosphonates.Atypical femur fractures most commonly occur with minimal or no trauma to the affected area. They may be bilateral and many patients report prodromal pain in the affected area, usually presenting as dull, aching thigh pain, weeks to months before complete fracture occurs. number of reports note that patients were also receiving treatment with glucocorticoids (e.g., prednisone) at the time of fracture.Any patient with history of bisphosphonate exposure who presents with thigh or groin pain should be suspected of having an atypical fracture and should be evaluated to rule out an incomplete femur fracture. Patients presenting with an atypical fracture should also be assessed for symptoms and signs of fracture in the contralateral limb. Interruption of bisphosphonate therapy should be considered, pending risk/benefit assessment, on an individual basis.. 5.6 Renal Impairment. Alendronate sodium is not recommended for patients with creatinine clearance less than 35 mL/min.. 5.7 Glucocorticoid-Induced Osteoporosis. The risk versus benefit of alendronate for treatment at daily dosages of glucocorticoids less than 7.5 mg of prednisone or equivalent has not been established [see Indications and Usage 1.4 )]. Before initiating treatment, the gonadal hormonal status of both men and women should be ascertained and appropriate replacement considered. bone mineral density measurement should be made at the initiation of therapy and repeated after to 12 months of combined alendronate sodium and glucocorticoid treatment.