ADVERSE REACTIONS SECTION.

6 ADVERSE REACTIONS. The following clinically significant adverse reactions are described elsewhere in labeling:oRenal Impairment [see Warnings and Precautions (5.1)]oMesalamine-Induced Acute Intolerance Syndrome [see Warnings and Precautions (5.2)]oHypersensitivity Reactions [see Warnings and Precautions (5.3)]oHepatic Failure [see Warnings and Precautions (5.4)]oSevere Cutaneous Adverse Reactions [see Warnings and Precautions (5.5)]oUpper Gastrointestinal Tract Obstruction [see Warnings and Precautions (5.6)]oPhotosensitivity [see Warnings and Precautions (5.7)]oNephrolithiasis [see Warnings and Precautions (5.8)]. oRenal Impairment [see Warnings and Precautions (5.1)]. oMesalamine-Induced Acute Intolerance Syndrome [see Warnings and Precautions (5.2)]. oHypersensitivity Reactions [see Warnings and Precautions (5.3)]. oHepatic Failure [see Warnings and Precautions (5.4)]. oSevere Cutaneous Adverse Reactions [see Warnings and Precautions (5.5)]. oUpper Gastrointestinal Tract Obstruction [see Warnings and Precautions (5.6)]. oPhotosensitivity [see Warnings and Precautions (5.7)]. oNephrolithiasis [see Warnings and Precautions (5.8)]. Most common adverse reactions (>=3%) are: headache, abdominal pain, diarrhea, nausea, vomiting, respiratory infection, and arthralgia. Adverse reactions in pediatric patients were similar. (6.1)To report SUSPECTED ADVERSE REACTIONS, contact Salix Pharmaceuticals at 1-800-321-4576 or 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 practice.Adult Ulcerative ColitisDuring clinical development, 259 adult patients with active ulcerative colitis were exposed to 6.75 g/day COLAZAL in controlled trials. In the controlled clinical trials patients receiving COLAZAL dose of 6.75 g/day most frequently reported the following adverse reactions: headache (8%), abdominal pain (6%), diarrhea (5%), nausea (5%), vomiting (4%), respiratory infection (4%), and arthralgia (4%). Withdrawal from therapy due to adverse reactions was comparable among patients on COLAZAL and placebo.Adverse reactions reported by 1% or more of patients who participated in the well-controlled, Phase trials are presented by treatment group (Table 1).The number of placebo patients (35), however, is too small for valid comparisons. Some adverse reactions, such as abdominal pain, fatigue, and nausea were reported more frequently in women than in men. Abdominal pain, rectal bleeding, and anemia can be part of the clinical presentation of ulcerative colitis.Table 1: Adverse Reactions Occurring in >=1% of Adult COLAZAL Patients in Controlled TrialsAdverse reactions occurring in at least 1% of COLAZAL patients which were less frequent than placebo for the same adverse reaction were not included in the table. Adverse ReactionCOLAZAL 6.75 g/day[N=259]Placebo[N=35] Abdominal pain 16 (6%) (3%) Diarrhea 14 (5%) (3%) Arthralgia (4%) 0% Rhinitis (2%) 0% Insomnia (2%) 0% Fatigue (2%) 0% Flatulence (2%) 0% Fever (2%) 0% Dyspepsia (2%) 0% Pharyngitis (2%) 0% Coughing (2%) 0% Anorexia (2%) 0% Urinary tract infection (1%) 0% Myalgia (1%) 0% Flu-like disorder (1%) 0% Dry mouth (1%) 0% Cramps (1%) 0% Constipation (1%) 0%Pediatric Ulcerative ColitisIn clinical trial in 68 pediatric patients aged to 17 years with mildly to moderately active ulcerative colitis who received 6.75 g/day or 2.25 g/day COLAZAL for weeks, the most frequently reported adverse reactions were headache (15%), abdominal pain upper (13%), abdominal pain (12%), vomiting (10%), diarrhea (9%), colitis ulcerative (6%), nasopharyngitis (6%), and pyrexia (6%) [see Table 2]. One patient who received COLAZAL 6.75 g/day and patients who received COLAZAL 2.25 g/day discontinued treatment because of adverse reactions. In addition, patients in each dose group discontinued because of lack of efficacy.Adverse reactions reported by 3% or more of pediatric patients within either treatment group in the Phase trial are presented in Table 2.Table 2: Treatment-Emergent Adverse Reactions Reported by >=3% of Patients in Either Treatment Group in Controlled Study of 68 Pediatric PatientsCOLAZALAdverse Reaction6.75 g/day[N=33]2.25 g/day[N=35]Total[N=68] Headache (15%) (14%) 10 (15%) Abdominal pain upper (9%) (17%) (13%) Abdominal pain (12%) (11%) (12%) Vomiting (3%) (17%) (10%) Diarrhea (6%) (11%) (9%) Colitis ulcerative (6%) (6%) (6%) Nasopharyngitis (9%) (3%) (6%) Pyrexia (0%) (11%) (6%) Hematochezia (0%) (9%) (4%) Nausea (0%) (9%) (4%) Influenza (3%) (6%) (4%) Fatigue (6%) (3%) (4%) Stomatitis (0%) (6%) (3%) Cough (0%) (6%) (3%) Pharyngolaryngeal pain (6%) (0%) (3%) Dysmenorrhea (6%) (0%) (3%). 6.2 Postmarketing Experience. The following adverse reactions have been identified during post-approval use of balsalazide, or other products which contain or are metabolized to mesalamine. 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.Cardiovascular and Vascular: Myocarditis, pericarditis, vasculitis [see Warnings and Precautions (5.3)]Respiratory: pleural effusion, pneumonia (with and without eosinophilia), alveolitis, pleurisy/pleuritis Renal: renal failure, interstitial nephritis, nephrolithiasis [see Warnings and Precautions (5.1, 5.8)]Gastrointestinal: pancreatitis Dermatologic: pruritus, alopeciaHepatic: hepatotoxicity, elevated liver function tests (SGOT/AST, SGPT/ALT, GGT, LDH, alkaline phosphatase, bilirubin), jaundice, cholestatic jaundice, cirrhosis, hepatocellular damage including liver necrosis and liver failure, Kawasaki-like syndrome including hepatic dysfunctionSkin: SJS/TEN, DRESS, and AGEP [see Warnings and Precautions (5.5)].

CLINICAL PHARMACOLOGY SECTION.

12 CLINICAL PHARMACOLOGY. 12.1 Mechanism of Action. Balsalazide disodium is delivered intact to the colon where it is cleaved by bacterial azoreduction to release equimolar quantities of mesalamine, which is the therapeutically active portion of the molecule, and the 4-aminobenzoyl-ss-alanine carrier moiety. The carrier moiety released when balsalazide disodium is cleaved is only minimally absorbed and is largely inert.The mechanism of action of 5-ASA is not fully understood, but appears to be local anti-inflammatory effect on colonic epithelial cells. Mucosal production of arachidonic acid metabolites, both through the cyclooxygenase pathways, i.e., prostanoids, and through the lipoxygenase pathways, i.e., leukotrienes and hydroxyeicosatetraenoic acids, is increased in patients with ulcerative colitis, and it is possible that 5-ASA diminishes inflammation by blocking production of arachidonic acid metabolites in the colon.. 12.3 Pharmacokinetics. COLAZAL capsules contain powder of balsalazide disodium that is insoluble in acid and designed to be delivered to the colon as the intact prodrug. Upon reaching the colon, bacterial azoreductases cleave the compound to release 5-ASA, the therapeutically active portion of the molecule, and 4-aminobenzoyl-ss-alanine. The 5-ASA is further metabolized to yield N-acetyl-5-aminosalicylic acid (N-Ac-5-ASA), second key metabolite.AbsorptionIn study of adult patients with ulcerative colitis, who received balsalazide, 1.5 twice daily, for over year, systemic drug exposure, based on mean AUC values, was up to 60 times greater (0.008 ughr/mL to 0.480 ughr/mL) when compared to that obtained in healthy subjects who received the same dose. Effect of FoodThe plasma pharmacokinetics of balsalazide and its key metabolites from crossover study in healthy subjects are summarized in Table 3. In this study, single oral dose of COLAZAL 2.25 was administered to healthy volunteers as intact capsules (3 750 mg) under fasting conditions, as intact capsules (3 750 mg) after high-fat meal, and unencapsulated (3 750 mg) as sprinkles on applesauce.Table 3: Plasma Pharmacokinetics for Balsalazide and Key Metabolites (5--ASA and N-Ac-5-ASA) with Administration of COLAZAL Following Fast, High-Fat Meal, and Drug Contents Sprinkled on Applesauce (Mean +- SD)FastingN=17High-fat Meal N=17Sprinkled N=17 Cmax (ug/mL) Balsalazide 0.51 +- 0.32 0.45 +- 0.39 0.21 +- 0.12 5-ASA 0.22 +- 0.12 0.11 +- 0.136 0.29 +- 0.17 N-Ac-5-ASA 0.88 +- 0.39 0.64 +- 0.534 1.04 +- 0.57 AUClast (ug.hr/mL) Balsalazide 1.35 +- 0.73 1.52 +- 1.01 0.87 +- 0.48 5-ASA 2.59 +- 1.46 2.10 +- 2.58 2.99 +- 1.70 N-Ac-5-ASA 17.8 +- 8.14 17.7 +- 13.7 20.0 +- 11.4 Tmax (h) Balsalazide 0.8 +- 0.85 1.2 +- 1.11 1.6 +- 0.44 5-ASA 8.2 +- 1.98 22.0 +- 8.23 8.7 +- 1.99 N-Ac-5-ASA 9.9 +- 2.49 20.2 +- 8.94 10.8 +- 5.39A relatively low systemic exposure was observed under all three administered conditions (fasting, fed with high-fat meal, sprinkled on applesauce), which reflects the variable, but minimal absorption of balsalazide disodium and its metabolites. The data indicate that both Cmax and AUClast were lower, while Tmax was markedly prolonged, under fed (high-fat meal) compared to fasted conditions. Moreover, the data suggest that dosing balsalazide disodium as sprinkle or as capsule provides highly variable, but relatively similar mean pharmacokinetic parameter values. No inference can be made as to how the systemic exposure differences of balsalazide and its metabolites in this study might predict the clinical efficacy under different dosing conditions (i.e., fasted, fed with high-fat meal, or sprinkled on applesauce) since clinical efficacy after balsalazide disodium administration is presumed to be primarily due to the local effects of 5-ASA on the colonic mucosa [see Dosage and Administration (2.1)]. DistributionThe binding of balsalazide to human plasma proteins was >= 99%.EliminationMetabolismThe products of the azoreduction of this compound, 5-ASA and 4-aminobenzoyl-ss-alanine, and their N-acetylated metabolites have been identified in plasma, urine and feces.ExcretionFollowing single-dose administration of 2.25 COLAZAL (three 750 mg capsules) under fasting conditions in healthy subjects, mean urinary recovery of balsalazide, 5-ASA, and N-Ac-5-ASA was 0.20%, 0.22% and 10.2%, respectively.In multiple-dose study in healthy subjects receiving COLAZAL dose of two 750 mg capsules twice daily (3 g/day) for 10 days, mean urinary recovery of balsalazide, 5-ASA, and N-Ac-5-ASA was 0.1%, 0%, and 11.3%, respectively. During this study, subjects received their morning dose 0.5 hours after being fed standard meal, and subjects received their evening dose hours after being fed standard meal. In study with 10 healthy subjects, 65% of single 2.25-gram dose of COLAZAL was recovered as 5-ASA, 4-aminobenzoyl-ss-alanine, and the N-acetylated metabolites in feces, while <1% of the dose was recovered as parent compound.In study that examined the disposition of balsalazide in patients who were taking 3-6 of COLAZAL daily for more than year and who were in remission from ulcerative colitis, less than 1% of an oral dose was recovered as intact balsalazide in the urine. Less than 4% of the dose was recovered as 5-ASA, while virtually no 4-aminobenzoyl-ss-alanine was detected in urine. The mean urinary recovery of N-Ac-5-ASA and N-acetyl-4-aminobenzoyl-ss-alanine comprised <16% and <12% of the balsalazide dose, respectively. No fecal recovery studies were performed in this population.Use in Specific PopulationsPediatric PatientsIn studies of pediatric patients with mild-to-moderate active ulcerative colitis receiving three 750 mg COLAZAL capsules times daily (6.75 g/day) for weeks, steady state was reached within weeks, as observed in adult patients. Likewise, the pharmacokinetics of balsalazide, 5-ASA, and N-Ac-5-ASA were characterized by very large inter-patient variability, which is also similar to that seen in adult patients.The pro-drug moiety, balsalazide, appeared to exhibit dose-independent (i.e., dose-linear) kinetics in children, and the systemic exposure parameters (Cmax and AUC0-8) increased in an almost dose-proportional fashion after the 6.75 g/day versus the 2.25 g/day doses. However, the absolute magnitude of these exposure parameters was greater relative to adults. The Cmax and AUC0-8 observed in pediatric patients were 26% and 102% greater than those observed in adult patients at the 6.75 g/day dosage level. In contrast, the systemic exposure parameters for the active metabolites, 5-ASA and N-Ac-5-ASA, in pediatric patients increased in less than dose-proportional manner after the 6.75 g/day dose versus the 2.25 g/day dose. Additionally, the magnitude of these exposure parameters was decreased for both metabolites relative to adults. For the metabolite of key safety concern from systemic exposure perspective, 5-ASA, the Cmax and AUC0-8 observed in pediatric patients were 67% and 64% lower than those observed in adult patients at the 6.75 g/day dosage level. Likewise, for N-Ac-5-ASA, the Cmax and AUC0-8 observed in pediatric patients were 68% and 55% lower than those observed in adult patients at the 6.75 g/day dosage level.All pharmacokinetic studies with COLAZAL are characterized by large variability in the plasma concentration versus time profiles for balsalazide and its metabolites, thus half-life estimates of these analytes are indeterminate.Drug Interaction StudiesIn Vitro DataIn an in vitro study using human liver microsomes, balsalazide and its metabolites [5- aminosalicylic acid (5-ASA), N-acetyl-5-aminosalicylic acid (N-Ac-5-ASA), 4-aminobenzoyl-ss-alanine (4-ABA) and N-acetyl-4-aminobenzoyl-ss-alanine (N-Ac-4-ABA)] were not shown to inhibit the major CYP enzymes evaluated (CYP1A2, CYP2C9, CYP2C19, CYP2D6, and CYP3A4/5). Therefore, balsalazide and its metabolites are not expected to inhibit the metabolism of other drugs which are substrates of CYP1A2, CYP2C9, CYP2C19, CYP2D6, or CYP3A4/5.

DOSAGE & ADMINISTRATION SECTION.

2 DOSAGE AND ADMINISTRATION. Administration InstructionsoEvaluate renal function before initiating therapy with COLAZAL. (2.1)oSwallow capsules whole. Do not cut, break, crush or chew. (2.1)oFor patients who cannot swallow intact capsules, the capsules may be opened and sprinkled on applesauce, then chewed and swallowed immediately. (2)oTeeth and/or tongue staining may occur when administered sprinkled on applesauce.oDrink an adequate amount of fluids. (2, 5.7)oTake COLAZAL with or without food. (2.1)DosageoAdults: The recommended dosage is 2.25 (three 750 mg capsules) three times daily for weeks. Some adult patients required treatment for up to 12 weeks in clinical trials. (2.2)oPediatric Patients Years to 17 Years of Age: The recommended dosage is either: o2.25 (three 750 mg capsules) three times for up to weeks. OR:o750 mg (one capsule) three times daily for up to weeks. (2.2). oEvaluate renal function before initiating therapy with COLAZAL. (2.1). oSwallow capsules whole. Do not cut, break, crush or chew. (2.1). oFor patients who cannot swallow intact capsules, the capsules may be opened and sprinkled on applesauce, then chewed and swallowed immediately. (2). oTeeth and/or tongue staining may occur when administered sprinkled on applesauce.. oDrink an adequate amount of fluids. (2, 5.7). oTake COLAZAL with or without food. (2.1). oAdults: The recommended dosage is 2.25 (three 750 mg capsules) three times daily for weeks. Some adult patients required treatment for up to 12 weeks in clinical trials. (2.2). oPediatric Patients Years to 17 Years of Age: The recommended dosage is either: o2.25 (three 750 mg capsules) three times for up to weeks.. OR:. o750 mg (one capsule) three times daily for up to weeks. (2.2). 2.1 Important Preparation and Administration Instructions oEvaluate renal function before initiating therapy with COLAZAL [see Warnings and Precaution (5.1)]. oSwallow COLAZAL capsules whole. Do not cut, break, crush or chew the capsules. oFor patients who cannot swallow intact capsules, COLAZAL may also be administered by opening the capsule and sprinkling the capsule contents on applesauce. If the capsules are opened for sprinkling, color variation of the powder inside the capsules ranges from orange to yellow and is expected due to color variation of the active pharmaceutical ingredient. oPlace small amount (approximately 10 mL) of applesauce into clean container.oCarefully open the capsules.oSprinkle the capsule contents on the applesauce.oMix the capsule contents with the applesauce. The contents may be chewed, if necessary.oConsume the entire amount of applesauce mixture immediately. Do not store the applesauce mixture for future use.oTeeth and/or tongue staining may occur in some patients when administered sprinkled on applesauce.oDrink an adequate amount of fluids [see Warnings and Precautions (5.8)].oTake COLAZAL with or without food [see Clinical Pharmacology (12.3)].. oEvaluate renal function before initiating therapy with COLAZAL [see Warnings and Precaution (5.1)]. oSwallow COLAZAL capsules whole. Do not cut, break, crush or chew the capsules. oFor patients who cannot swallow intact capsules, COLAZAL may also be administered by opening the capsule and sprinkling the capsule contents on applesauce. If the capsules are opened for sprinkling, color variation of the powder inside the capsules ranges from orange to yellow and is expected due to color variation of the active pharmaceutical ingredient. oPlace small amount (approximately 10 mL) of applesauce into clean container.oCarefully open the capsules.oSprinkle the capsule contents on the applesauce.oMix the capsule contents with the applesauce. The contents may be chewed, if necessary.oConsume the entire amount of applesauce mixture immediately. Do not store the applesauce mixture for future use.oTeeth and/or tongue staining may occur in some patients when administered sprinkled on applesauce.. oPlace small amount (approximately 10 mL) of applesauce into clean container.. oCarefully open the capsules.. oSprinkle the capsule contents on the applesauce.. oMix the capsule contents with the applesauce. The contents may be chewed, if necessary.. oConsume the entire amount of applesauce mixture immediately. Do not store the applesauce mixture for future use.. oTeeth and/or tongue staining may occur in some patients when administered sprinkled on applesauce.. oDrink an adequate amount of fluids [see Warnings and Precautions (5.8)].. oTake COLAZAL with or without food [see Clinical Pharmacology (12.3)].. 2.2 Recommended Dosage in Adults and Pediatric Patients Years to 17 Years of Age. AdultsThe recommended dosage in adults is 2.25 (three 750 mg capsules) three times daily for up to weeks. Some patients in the adult clinical trials required treatment for up to 12 weeks. Pediatric Patients Years to 17 Years of AgeThe recommended dosage in pediatric patients years to 17 years of age is either:o2.25 (three 750 mg capsules) three times daily for up to weeks; OR:o750 mg (one capsule) three times daily for up to weeks.Use of COLAZAL in the pediatric population for more than weeks has not been evaluated in clinical trials [see Clinical Studies (14)]. o2.25 (three 750 mg capsules) three times daily for up to weeks; OR:. o750 mg (one capsule) three times daily for up to weeks.

DRUG INTERACTIONS SECTION.

7 DRUG INTERACTIONS oNephrotoxic Agents including NSAIDs: Increased risk of nephrotoxicity; monitor for changes in renal function and mesalamine-related adverse reactions. (7.1)oAzathioprine or 6-Mercaptopurine: Increased risk of blood disorders; monitor complete blood cell counts and platelet counts. (7.2) oNephrotoxic Agents including NSAIDs: Increased risk of nephrotoxicity; monitor for changes in renal function and mesalamine-related adverse reactions. (7.1). oAzathioprine or 6-Mercaptopurine: Increased risk of blood disorders; monitor complete blood cell counts and platelet counts. (7.2) 7.1 Nephrotoxic Agents, Including Non-Steroidal Anti-Inflammatory Drugs The concurrent use of mesalamine with known nephrotoxic agents, including non-steroidal anti-inflammatory drugs (NSAIDs), may increase the risk of renal reactions. Monitor patients taking nephrotoxic drugs for changes in renal function and mesalamine-related adverse reactions [see Warnings and Precautions (5.1 )]. 7.2 Azathioprine or 6-Mercaptopurine The concurrent use of mesalamine with azathioprine or 6-mercaptopurine and/or any other drugs known to cause myelotoxicity may increase the risk for blood disorders, bone marrow failure, and associated complications. If concomitant use of COLAZAL and azathioprine or 6-mercaptopurine cannot be avoided, monitor blood tests, including complete blood cell counts and platelet counts.. 7.3 Interference With Urinary Normetanephrine Measurements Use of COLAZAL, which is converted to mesalamine, may lead to spuriously elevated test results when measuring urinary normetanephrine by liquid chromatography with electrochemical detection [see Warnings and Precautions (5.9)]. Consider an alternative, selective assay for normetanephrine.

INFORMATION FOR PATIENTS SECTION.

17 PATIENT COUNSELING INFORMATION. Renal ImpairmentInform patients that COLAZAL may decrease their renal function, especially if they have known renal impairment or are taking nephrotoxic drugs, including NSAIDs, and periodic monitoring of renal function will be performed while they are on therapy. Advise patients to complete all blood tests ordered by their healthcare provider [see Warnings and Precautions (5.1), Drug Interactions (7.1 )].Mesalamine-Induced Acute Intolerance Syndrome and Other Hypersensitivity ReactionsInform patients of the signs and symptoms of hypersensitivity reactions. Instruct patients to stop taking COLAZAL and report to their healthcare provider if they experience new or worsening symptoms of Acute Intolerance Syndrome (cramping, abdominal pain, bloody diarrhea, fever, headache, and rash) or other symptoms suggestive of mesalamine-induced hypersensitivity [see Warnings and Precautions (5.2, 5.3 )].Hepatic FailureInform patients with known liver disease of the signs and symptoms of worsening liver function and advise them to report to their healthcare provider if they experience such signs or symptoms [see Warnings and Precautions (5.4)].Severe Cutaneous Adverse ReactionsInform patients of the signs and symptoms of severe cutaneous adverse reactions. Instruct patients to stop taking COLAZAL and report to their healthcare provider at first appearance of severe cutaneous adverse reaction or other sign of hypersensitivity [see Warnings and Precautions (5.5)]. Upper Gastrointestinal Tract Obstruction Advise patients to contact their healthcare provider if they experience signs and symptoms of upper gastrointestinal tract obstruction [see Warnings and Precautions (5.6)]. PhotosensitivityAdvise patients with pre-existing skin conditions to avoid sun exposure, wear protective clothing, and use broad-spectrum sunscreen when outdoors [see Warnings and Precautions (5.7)].NephrolithiasisInstruct patients to drink an adequate amount of fluids during treatment in order to minimize the risk of kidney stone formation and to contact their healthcare provider if they experience signs or symptoms of kidney stone (e.g., severe side or back pain, blood in the urine) [see Warnings and Precautions (5.8)].Blood DisordersInform elderly patients and those taking azathioprine or 6-mercaptopurine of the risk for blood disorders and the need for periodic monitoring of complete blood cell counts and platelet counts while on therapy. Advise patients to complete all blood tests ordered by their healthcare provider [see Drug Interactions (7.2), Use in Specific Populations (8.5)].AdministrationInstruct patients:oSwallow COLAZAL capsules whole. Do not cut, break, crush or chew the capsules. oFor patients who cannot swallow intact capsules, COLAZAL may also be administered by opening the capsule and sprinkling the capsule contents on applesauce. If the capsules are opened for sprinkling, color variation of the powder inside the capsules ranges from orange to yellow and is expected due to color variation of the active pharmaceutical ingredient. oPlace small amount (approximately 10 mL) of applesauce into clean container.oCarefully open the capsules.oSprinkle the capsule contents on the applesauce.oMix the capsule contents with the applesauce. The contents may be chewed, if necessary.oConsume the entire amount of applesauce mixture immediately. Do not store the applesauce mixture for future use.oTeeth and/or tongue staining may occur in some patients who use COLAZAL in sprinkle form with food.oDrink an adequate amount of fluids.oTake COLAZAL without regard to meals [see Clinical Pharmacology (12.3)].Distributed by: Salix Pharmaceuticals, division of Bausch Health US, LLC Bridgewater, NJ 08807 USAManufactured by:LGM Pharma Solutions, LLCIrvine, CA 92614 USAU.S. Patent Numbers: 7,452,872 and 7,625,884COLAZAL is trademark of Salix Pharmaceuticals, Inc. or its affiliates.(C) 2021 Salix Pharmaceuticals, Inc. or its affiliates9462604. oSwallow COLAZAL capsules whole. Do not cut, break, crush or chew the capsules. oFor patients who cannot swallow intact capsules, COLAZAL may also be administered by opening the capsule and sprinkling the capsule contents on applesauce. If the capsules are opened for sprinkling, color variation of the powder inside the capsules ranges from orange to yellow and is expected due to color variation of the active pharmaceutical ingredient. oPlace small amount (approximately 10 mL) of applesauce into clean container.oCarefully open the capsules.oSprinkle the capsule contents on the applesauce.oMix the capsule contents with the applesauce. The contents may be chewed, if necessary.oConsume the entire amount of applesauce mixture immediately. Do not store the applesauce mixture for future use.oTeeth and/or tongue staining may occur in some patients who use COLAZAL in sprinkle form with food.. oPlace small amount (approximately 10 mL) of applesauce into clean container.. oCarefully open the capsules.. oSprinkle the capsule contents on the applesauce.. oMix the capsule contents with the applesauce. The contents may be chewed, if necessary.. oConsume the entire amount of applesauce mixture immediately. Do not store the applesauce mixture for future use.. oTeeth and/or tongue staining may occur in some patients who use COLAZAL in sprinkle form with food.. oDrink an adequate amount of fluids.. oTake COLAZAL without regard to meals [see Clinical Pharmacology (12.3)].

NONCLINICAL TOXICOLOGY SECTION.

13 NONCLINICAL TOXICOLOGY. 13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility. In 24-month rat (Sprague Dawley) carcinogenicity study, oral (dietary) balsalazide disodium at doses up to g/kg/day was not tumorigenic. For 50-kg person of average height this dose represents 2.4 times the recommended human dose on body surface area basis. Balsalazide disodium was not genotoxic in the following in vitro or in vivo tests: Ames test, human lymphocyte chromosomal aberration test, and mouse lymphoma cell (L5178Y/TK+/-) forward mutation test, or mouse micronucleus test. However, it was genotoxic in the in vitro Chinese hamster lung cell (CH V79/HGPRT) forward mutation test.4-aminobenzoyl-ss-alanine, metabolite of balsalazide disodium, was not genotoxic in the Ames test and the mouse lymphoma cell (L5178Y/TK+/-) forward mutation test but was positive in the human lymphocyte chromosomal aberration test. N-acetyl-4-aminobenzoyl-ss-alanine, conjugated metabolite of balsalazide disodium, was not genotoxic in Ames test, the mouse lymphoma cell (L5178Y/TK+/-) forward mutation test, or the human lymphocyte chromosomal aberration test. Balsalazide disodium at oral doses up to g/kg/day, 2.4 times the recommended human dose based on body surface area, was found to have no effect on fertility and reproductive performance in rats. 13.2 Animal Toxicology and/or Pharmacology. Renal ToxicityIn animal studies conducted at doses up to 2000 mg/kg (approximately 21 times the recommended 6.75 g/day dose on mg/kg basis for 70 kg person), COLAZAL demonstrated no nephrotoxic effects in rats or dogs.OverdosageA single oral dose of balsalazide disodium at g/kg or 4-aminobenzoyl-ss-alanine, metabolite of balsalazide disodium, at g/kg was non-lethal in mice and rats. No symptoms of acute toxicity were seen at these doses.

PHARMACOKINETICS SECTION.

12.3 Pharmacokinetics. COLAZAL capsules contain powder of balsalazide disodium that is insoluble in acid and designed to be delivered to the colon as the intact prodrug. Upon reaching the colon, bacterial azoreductases cleave the compound to release 5-ASA, the therapeutically active portion of the molecule, and 4-aminobenzoyl-ss-alanine. The 5-ASA is further metabolized to yield N-acetyl-5-aminosalicylic acid (N-Ac-5-ASA), second key metabolite.AbsorptionIn study of adult patients with ulcerative colitis, who received balsalazide, 1.5 twice daily, for over year, systemic drug exposure, based on mean AUC values, was up to 60 times greater (0.008 ughr/mL to 0.480 ughr/mL) when compared to that obtained in healthy subjects who received the same dose. Effect of FoodThe plasma pharmacokinetics of balsalazide and its key metabolites from crossover study in healthy subjects are summarized in Table 3. In this study, single oral dose of COLAZAL 2.25 was administered to healthy volunteers as intact capsules (3 750 mg) under fasting conditions, as intact capsules (3 750 mg) after high-fat meal, and unencapsulated (3 750 mg) as sprinkles on applesauce.Table 3: Plasma Pharmacokinetics for Balsalazide and Key Metabolites (5--ASA and N-Ac-5-ASA) with Administration of COLAZAL Following Fast, High-Fat Meal, and Drug Contents Sprinkled on Applesauce (Mean +- SD)FastingN=17High-fat Meal N=17Sprinkled N=17 Cmax (ug/mL) Balsalazide 0.51 +- 0.32 0.45 +- 0.39 0.21 +- 0.12 5-ASA 0.22 +- 0.12 0.11 +- 0.136 0.29 +- 0.17 N-Ac-5-ASA 0.88 +- 0.39 0.64 +- 0.534 1.04 +- 0.57 AUClast (ug.hr/mL) Balsalazide 1.35 +- 0.73 1.52 +- 1.01 0.87 +- 0.48 5-ASA 2.59 +- 1.46 2.10 +- 2.58 2.99 +- 1.70 N-Ac-5-ASA 17.8 +- 8.14 17.7 +- 13.7 20.0 +- 11.4 Tmax (h) Balsalazide 0.8 +- 0.85 1.2 +- 1.11 1.6 +- 0.44 5-ASA 8.2 +- 1.98 22.0 +- 8.23 8.7 +- 1.99 N-Ac-5-ASA 9.9 +- 2.49 20.2 +- 8.94 10.8 +- 5.39A relatively low systemic exposure was observed under all three administered conditions (fasting, fed with high-fat meal, sprinkled on applesauce), which reflects the variable, but minimal absorption of balsalazide disodium and its metabolites. The data indicate that both Cmax and AUClast were lower, while Tmax was markedly prolonged, under fed (high-fat meal) compared to fasted conditions. Moreover, the data suggest that dosing balsalazide disodium as sprinkle or as capsule provides highly variable, but relatively similar mean pharmacokinetic parameter values. No inference can be made as to how the systemic exposure differences of balsalazide and its metabolites in this study might predict the clinical efficacy under different dosing conditions (i.e., fasted, fed with high-fat meal, or sprinkled on applesauce) since clinical efficacy after balsalazide disodium administration is presumed to be primarily due to the local effects of 5-ASA on the colonic mucosa [see Dosage and Administration (2.1)]. DistributionThe binding of balsalazide to human plasma proteins was >= 99%.EliminationMetabolismThe products of the azoreduction of this compound, 5-ASA and 4-aminobenzoyl-ss-alanine, and their N-acetylated metabolites have been identified in plasma, urine and feces.ExcretionFollowing single-dose administration of 2.25 COLAZAL (three 750 mg capsules) under fasting conditions in healthy subjects, mean urinary recovery of balsalazide, 5-ASA, and N-Ac-5-ASA was 0.20%, 0.22% and 10.2%, respectively.In multiple-dose study in healthy subjects receiving COLAZAL dose of two 750 mg capsules twice daily (3 g/day) for 10 days, mean urinary recovery of balsalazide, 5-ASA, and N-Ac-5-ASA was 0.1%, 0%, and 11.3%, respectively. During this study, subjects received their morning dose 0.5 hours after being fed standard meal, and subjects received their evening dose hours after being fed standard meal. In study with 10 healthy subjects, 65% of single 2.25-gram dose of COLAZAL was recovered as 5-ASA, 4-aminobenzoyl-ss-alanine, and the N-acetylated metabolites in feces, while <1% of the dose was recovered as parent compound.In study that examined the disposition of balsalazide in patients who were taking 3-6 of COLAZAL daily for more than year and who were in remission from ulcerative colitis, less than 1% of an oral dose was recovered as intact balsalazide in the urine. Less than 4% of the dose was recovered as 5-ASA, while virtually no 4-aminobenzoyl-ss-alanine was detected in urine. The mean urinary recovery of N-Ac-5-ASA and N-acetyl-4-aminobenzoyl-ss-alanine comprised <16% and <12% of the balsalazide dose, respectively. No fecal recovery studies were performed in this population.Use in Specific PopulationsPediatric PatientsIn studies of pediatric patients with mild-to-moderate active ulcerative colitis receiving three 750 mg COLAZAL capsules times daily (6.75 g/day) for weeks, steady state was reached within weeks, as observed in adult patients. Likewise, the pharmacokinetics of balsalazide, 5-ASA, and N-Ac-5-ASA were characterized by very large inter-patient variability, which is also similar to that seen in adult patients.The pro-drug moiety, balsalazide, appeared to exhibit dose-independent (i.e., dose-linear) kinetics in children, and the systemic exposure parameters (Cmax and AUC0-8) increased in an almost dose-proportional fashion after the 6.75 g/day versus the 2.25 g/day doses. However, the absolute magnitude of these exposure parameters was greater relative to adults. The Cmax and AUC0-8 observed in pediatric patients were 26% and 102% greater than those observed in adult patients at the 6.75 g/day dosage level. In contrast, the systemic exposure parameters for the active metabolites, 5-ASA and N-Ac-5-ASA, in pediatric patients increased in less than dose-proportional manner after the 6.75 g/day dose versus the 2.25 g/day dose. Additionally, the magnitude of these exposure parameters was decreased for both metabolites relative to adults. For the metabolite of key safety concern from systemic exposure perspective, 5-ASA, the Cmax and AUC0-8 observed in pediatric patients were 67% and 64% lower than those observed in adult patients at the 6.75 g/day dosage level. Likewise, for N-Ac-5-ASA, the Cmax and AUC0-8 observed in pediatric patients were 68% and 55% lower than those observed in adult patients at the 6.75 g/day dosage level.All pharmacokinetic studies with COLAZAL are characterized by large variability in the plasma concentration versus time profiles for balsalazide and its metabolites, thus half-life estimates of these analytes are indeterminate.Drug Interaction StudiesIn Vitro DataIn an in vitro study using human liver microsomes, balsalazide and its metabolites [5- aminosalicylic acid (5-ASA), N-acetyl-5-aminosalicylic acid (N-Ac-5-ASA), 4-aminobenzoyl-ss-alanine (4-ABA) and N-acetyl-4-aminobenzoyl-ss-alanine (N-Ac-4-ABA)] were not shown to inhibit the major CYP enzymes evaluated (CYP1A2, CYP2C9, CYP2C19, CYP2D6, and CYP3A4/5). Therefore, balsalazide and its metabolites are not expected to inhibit the metabolism of other drugs which are substrates of CYP1A2, CYP2C9, CYP2C19, CYP2D6, or CYP3A4/5.

PREGNANCY SECTION.

8.1 Pregnancy. Risk SummaryPublished data from meta-analyses, cohort studies and case series on the use of mesalamine, the active moiety of COLAZAL, during pregnancy have not reliably informed an association with mesalamine and major birth defects, miscarriage, or adverse maternal or fetal outcomes (see Data). There are adverse effects on maternal and fetal outcomes associated with ulcerative colitis in pregnancy (see Clinical Considerations). In animal reproduction studies, there were no adverse developmental effects observed after oral administration of balsalazide disodium in pregnant rats and rabbits during organogenesis at doses up to 2.4 and 4.7 times, respectively, the maximum recommended human dose (MRHD) (see Data).The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.Clinical ConsiderationsDisease-associated maternal and embryo/fetal riskPublished data suggest that increased disease activity is associated with the risk of developing adverse pregnancy outcomes in women with ulcerative colitis. Adverse pregnancy outcomes include preterm delivery (before 37 weeks of gestation), low birth weight (less than 2500 g) infants, and small for gestational age at birth.DataHuman DataPublished data from meta-analyses, cohort studies and case series on the use of mesalamine, the active moiety of COLAZAL, during early pregnancy (first trimester) and throughout pregnancy have not reliably informed an association of mesalamine and major birth defects, miscarriage, or adverse maternal or fetal outcomes. There is no clear evidence that mesalamine exposure in early pregnancy is associated with an increase risk in major congenital malformations, including cardiac malformations. Published epidemiologic studies have important methodological limitations which hinder interpretation of the data, including inability to control for confounders, such as underlying maternal disease, and maternal use of concomitant medications, and missing information on the dose and duration of use for mesalamine products. Animal DataReproduction studies were performed in rats and rabbits following administration of balsalazide during organogenesis at oral doses up to g/kg/day, 2.4 and 4.7 times the MRHD based on body surface area for the rat and rabbit, respectively, and revealed no adverse embryofetal developmental effects due to balsalazide disodium.

SPL UNCLASSIFIED SECTION.

2.1 Important Preparation and Administration Instructions oEvaluate renal function before initiating therapy with COLAZAL [see Warnings and Precaution (5.1)]. oSwallow COLAZAL capsules whole. Do not cut, break, crush or chew the capsules. oFor patients who cannot swallow intact capsules, COLAZAL may also be administered by opening the capsule and sprinkling the capsule contents on applesauce. If the capsules are opened for sprinkling, color variation of the powder inside the capsules ranges from orange to yellow and is expected due to color variation of the active pharmaceutical ingredient. oPlace small amount (approximately 10 mL) of applesauce into clean container.oCarefully open the capsules.oSprinkle the capsule contents on the applesauce.oMix the capsule contents with the applesauce. The contents may be chewed, if necessary.oConsume the entire amount of applesauce mixture immediately. Do not store the applesauce mixture for future use.oTeeth and/or tongue staining may occur in some patients when administered sprinkled on applesauce.oDrink an adequate amount of fluids [see Warnings and Precautions (5.8)].oTake COLAZAL with or without food [see Clinical Pharmacology (12.3)].. oEvaluate renal function before initiating therapy with COLAZAL [see Warnings and Precaution (5.1)]. oSwallow COLAZAL capsules whole. Do not cut, break, crush or chew the capsules. oFor patients who cannot swallow intact capsules, COLAZAL may also be administered by opening the capsule and sprinkling the capsule contents on applesauce. If the capsules are opened for sprinkling, color variation of the powder inside the capsules ranges from orange to yellow and is expected due to color variation of the active pharmaceutical ingredient. oPlace small amount (approximately 10 mL) of applesauce into clean container.oCarefully open the capsules.oSprinkle the capsule contents on the applesauce.oMix the capsule contents with the applesauce. The contents may be chewed, if necessary.oConsume the entire amount of applesauce mixture immediately. Do not store the applesauce mixture for future use.oTeeth and/or tongue staining may occur in some patients when administered sprinkled on applesauce.. oPlace small amount (approximately 10 mL) of applesauce into clean container.. oCarefully open the capsules.. oSprinkle the capsule contents on the applesauce.. oMix the capsule contents with the applesauce. The contents may be chewed, if necessary.. oConsume the entire amount of applesauce mixture immediately. Do not store the applesauce mixture for future use.. oTeeth and/or tongue staining may occur in some patients when administered sprinkled on applesauce.. oDrink an adequate amount of fluids [see Warnings and Precautions (5.8)].. oTake COLAZAL with or without food [see Clinical Pharmacology (12.3)].

USE IN SPECIFIC POPULATIONS SECTION.

8 USE IN SPECIFIC POPULATIONS. Geriatric Patients: Increased risk of blood dyscrasias; monitor blood cell counts and platelet counts. (8.5). 8.1 Pregnancy. Risk SummaryPublished data from meta-analyses, cohort studies and case series on the use of mesalamine, the active moiety of COLAZAL, during pregnancy have not reliably informed an association with mesalamine and major birth defects, miscarriage, or adverse maternal or fetal outcomes (see Data). There are adverse effects on maternal and fetal outcomes associated with ulcerative colitis in pregnancy (see Clinical Considerations). In animal reproduction studies, there were no adverse developmental effects observed after oral administration of balsalazide disodium in pregnant rats and rabbits during organogenesis at doses up to 2.4 and 4.7 times, respectively, the maximum recommended human dose (MRHD) (see Data).The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.Clinical ConsiderationsDisease-associated maternal and embryo/fetal riskPublished data suggest that increased disease activity is associated with the risk of developing adverse pregnancy outcomes in women with ulcerative colitis. Adverse pregnancy outcomes include preterm delivery (before 37 weeks of gestation), low birth weight (less than 2500 g) infants, and small for gestational age at birth.DataHuman DataPublished data from meta-analyses, cohort studies and case series on the use of mesalamine, the active moiety of COLAZAL, during early pregnancy (first trimester) and throughout pregnancy have not reliably informed an association of mesalamine and major birth defects, miscarriage, or adverse maternal or fetal outcomes. There is no clear evidence that mesalamine exposure in early pregnancy is associated with an increase risk in major congenital malformations, including cardiac malformations. Published epidemiologic studies have important methodological limitations which hinder interpretation of the data, including inability to control for confounders, such as underlying maternal disease, and maternal use of concomitant medications, and missing information on the dose and duration of use for mesalamine products. Animal DataReproduction studies were performed in rats and rabbits following administration of balsalazide during organogenesis at oral doses up to g/kg/day, 2.4 and 4.7 times the MRHD based on body surface area for the rat and rabbit, respectively, and revealed no adverse embryofetal developmental effects due to balsalazide disodium.. 8.2 Lactation Risk SummaryData from published literature report the presence of mesalamine and its metabolite, acetyl-5 aminosalicylic acid, in human milk in small amounts with relative infant doses (RID) of 0.1% or less for mesalamine (see Data). There are case reports of diarrhea in breastfed infants exposed to mesalamine (see Clinical Considerations). There is no information on the effects of the drug on milk production. The lack of clinical data during lactation precludes clear determination of the risk of COLAZAL to an infant during lactation; therefore, the developmental and health benefits of breastfeeding should be considered along with the mothers clinical need for COLAZAL and any potential adverse effects on the breastfed child from COLAZAL or from the underlying maternal condition. Clinical Considerations Advise the caregiver to monitor breastfed infants for diarrhea.DataIn published lactation studies, maternal mesalamine doses from various oral and rectal mesalamine formulations and products ranged from 500 mg to 4.8 daily. The average concentration of mesalamine in milk ranged from non-detectable to 0.5 mg/L. The average concentration of N-acetyl-5-aminosalicylic acid in milk ranged from 0.2 to 9.3 mg/L. Based on these concentrations, estimated infant daily dosages for an exclusively breastfed infant are to 0.075 mg/kg/day (RID to 0.1%) of mesalamine and 0.03 to 1.4 mg/kg/day of N-acetyl-5-aminosalicylic acid. 8.4 Pediatric Use. The safety and effectiveness of COLAZAL has been established for the treatment of mildly to moderately active ulcerative colitis in pediatric and adolescent patients years to 17 years of age. Use of COLAZAL for this indication is supported by evidence from adequate and well-controlled clinical studies in adults with additional pharmacokinetic and safety data in pediatric patients aged years to 17 years [see Adverse Reactions (6.1), Clinical Pharmacology (12.3), and Clinical Studies (14.2)].Based on the limited data available, dosing can be initiated at either 6.75 or 2.25 g/day [see Dosage and Administration (2.2 )]. The safety and effectiveness of COLAZAL in pediatric patients below the age of years have not been established.. The safety and effectiveness of COLAZAL has been established for the treatment of mildly to moderately active ulcerative colitis in pediatric and adolescent patients years to 17 years of age. Use of COLAZAL for this indication is supported by evidence from adequate and well-controlled clinical studies in adults with additional pharmacokinetic and safety data in pediatric patients aged years to 17 years [see Adverse Reactions (6.1), Clinical Pharmacology (12.3), and Clinical Studies (14.2)].. 8.5 Geriatric Use Clinical trials of COLAZAL did not include sufficient numbers of subjects aged 65 years and over to determine whether they respond differently than younger subjects. Reports from uncontrolled clinical studies and postmarketing reporting systems suggested higher incidence of blood dyscrasias, i.e., neutropenia and pancytopenia, in patients who were 65 years or older compare to younger patients taking mesalamine-containing products. COLAZAL is converted into mesalamine in the colon. Monitor complete blood cell counts and platelet counts in elderly patients during treatment with COLAZAL. In general, consider the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy in elderly patients when prescribing COLAZAL [see Use in Specific Populations (8.6)].. 8.6 Renal Impairment Mesalamine is known to be substantially excreted by the kidney, and the risk of adverse reactions to COLAZAL, which is converted to mesalamine, may be greater in patients with impaired renal function. Evaluate renal function in all patients prior to initiation and periodically while on COLAZAL therapy. Monitor patients with known renal impairment or history of renal disease or taking nephrotoxic drugs for decreased renal function and mesalamine-related adverse reactions [see Warnings and Precautions (5.1), Adverse Reactions (6.2), Drug Interactions (7.1)].

WARNINGS AND PRECAUTIONS SECTION.

5 WARNINGS AND PRECAUTIONS. oRenal Impairment: Assess renal function at the beginning of treatment and periodically during treatment. Evaluate the risks and benefits in patients with known renal impairment or taking nephrotoxic drugs; monitor renal function. (5.1, 7.2, 8.6)oMesalamine-Induced Acute Intolerance Syndrome: Symptoms may be difficult to distinguish from an exacerbation of ulcerative colitis; monitor for worsening symptoms; discontinue treatment if acute intolerance syndrome is suspected. (5.2)oHypersensitivity Reactions, including Myocarditis and Pericarditis: Evaluate patients immediately and discontinue if hypersensitivity reaction is suspected. (5.3)oHepatic Failure: Evaluate the risks and benefits in patients with known liver impairment. (5.4)oSevere Cutaneous Adverse Reactions: Discontinue at the first signs or symptoms of severe cutaneous adverse reactions or other signs of hypersensitivity and consider further evaluation (5.5) oUpper Gastrointestinal Tract Obstruction: Avoid in patients with pyloric stenosis or other organic or functional obstruction. (5.6)oPhotosensitivity: Advise patients with pre-existing skin conditions to avoid sun exposure, wear protective clothing, and use broad-spectrum sunscreen when outdoors. (5.7)oNephrolithiasis: Stones containing mesalamine, the active moiety in COLAZAL, are undetectable by standard radiography or computed tomography (CT). Ensure adequate fluid intake during treatment with COLAZAL. (5.8)oInterference with Laboratory Tests: Use of mesalamine may lead to spuriously elevated test results when measuring urinary normetanephrine by liquid chromatography with electrochemical detection. (5.9). oRenal Impairment: Assess renal function at the beginning of treatment and periodically during treatment. Evaluate the risks and benefits in patients with known renal impairment or taking nephrotoxic drugs; monitor renal function. (5.1, 7.2, 8.6). oMesalamine-Induced Acute Intolerance Syndrome: Symptoms may be difficult to distinguish from an exacerbation of ulcerative colitis; monitor for worsening symptoms; discontinue treatment if acute intolerance syndrome is suspected. (5.2). oHypersensitivity Reactions, including Myocarditis and Pericarditis: Evaluate patients immediately and discontinue if hypersensitivity reaction is suspected. (5.3). oHepatic Failure: Evaluate the risks and benefits in patients with known liver impairment. (5.4). oSevere Cutaneous Adverse Reactions: Discontinue at the first signs or symptoms of severe cutaneous adverse reactions or other signs of hypersensitivity and consider further evaluation (5.5) oUpper Gastrointestinal Tract Obstruction: Avoid in patients with pyloric stenosis or other organic or functional obstruction. (5.6). oPhotosensitivity: Advise patients with pre-existing skin conditions to avoid sun exposure, wear protective clothing, and use broad-spectrum sunscreen when outdoors. (5.7). oNephrolithiasis: Stones containing mesalamine, the active moiety in COLAZAL, are undetectable by standard radiography or computed tomography (CT). Ensure adequate fluid intake during treatment with COLAZAL. (5.8). oInterference with Laboratory Tests: Use of mesalamine may lead to spuriously elevated test results when measuring urinary normetanephrine by liquid chromatography with electrochemical detection. (5.9). 5.1 Renal Impairment. Renal impairment, including minimal change disease, acute and chronic interstitial nephritis, and renal failure, has been reported in patients given products such as COLAZAL that release mesalamine into the gastrointestinal tract. Evaluate renal function prior to initiation of COLAZAL and periodically while on therapy. Evaluate the risks and benefits of using COLAZAL in patients with known renal impairment, history of renal disease or taking nephrotoxic drugs [see Drug Interactions (7.2), Use in Specific Populations (8.6)].. 5.2 Mesalamine-Induced Acute Intolerance Syndrome. Balsalazide is converted to mesalamine, which has been associated with an acute intolerance syndrome that may be difficult to distinguish from an exacerbation of ulcerative colitis. Although the exact frequency of occurrence has not been determined, it has occurred in 3% of patients in controlled clinical trials of mesalamine or sulfasalazine. Symptoms include cramping, acute abdominal pain and bloody diarrhea, sometimes fever, headache, and rash. Monitor patients for worsening of these symptoms while on treatment. If acute intolerance syndrome is suspected, promptly discontinue treatment with COLAZAL.. 5.3 Hypersensitivity Reactions. Some patients have experienced hypersensitivity reaction to sulfasalazine may have similar reaction to COLAZAL or to other compounds that contain or are converted to mesalamine.Mesalamine-induced hypersensitivity reactions may present as internal organ involvement, including myocarditis, pericarditis, nephritis, hepatitis, pneumonitis and hematologic abnormalities. Evaluate patients immediately if signs or symptoms of hypersensitivity reaction are present. Discontinue COLAZAL if an alternative etiology for the signs and symptoms cannot be established. 5.4 Hepatic Failure There have been reports of hepatic failure in patients with pre-existing liver disease who have been administered mesalamine. Because balsalazide is converted to mesalamine, evaluate the risks and benefits of using COLAZAL in patients with known liver impairment.. 5.5 Severe Cutaneous Adverse Reactions Severe cutaneous adverse reactions, including Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN), drug reaction with eosinophilia and systemic symptoms (DRESS), and acute generalized exanthematous pustulosis (AGEP) have been reported with the use of mesalamine, the active moiety of COLAZAL [see Adverse Reactions (6.2)]. Discontinue COLAZAL at the first signs or symptoms of severe cutaneous adverse reactions or other signs of hypersensitivity and consider further evaluation.. 5.6 Upper Gastrointestinal Tract Obstruction Pyloric stenosis or other organic or functional obstruction in the upper gastrointestinal tract may cause prolonged gastric retention of COLAZAL, which would delay mesalamine release in the colon. Avoid COLAZAL in patients at risk of upper gastrointestinal tract obstruction. 5.7 Photosensitivity Patients with pre-existing skin conditions such as atopic dermatitis and atopic eczema have reported more severe photosensitivity reactions. Advise patients to avoid sun exposure, wear protective clothing, and use broad-spectrum sunscreen when outdoors.. 5.8 Nephrolithiasis Cases of nephrolithiasis have been reported with the use of mesalamine, the active moiety of COLAZAL, including stones with 100% mesalamine content. Mesalamine-containing stones are radiotransparent and undetectable by standard radiography or computed tomography (CT). Ensure adequate fluid intake during treatment with COLAZAL.. 5.9 Interference with Laboratory Tests Use of COLAZAL, which is converted to mesalamine, may lead to spuriously elevated test results when measuring urinary normetanephrine by liquid chromatography with electrochemical detection because of the similarity in the chromatograms of normetanephrine and the main metabolite of mesalamine, N-acetyl-5-aminosalicylic acid (N-Ac-5-ASA). Consider an alternative, selective assay for normetanephrine.