ADVERSE REACTIONS SECTION.

6 ADVERSE REACTIONS. The following serious adverse reactions are described in greater detail elsewhere in labeling:Hypotension/bradycardia [see Warnings and Precautions (5.1) Sedation and somnolence [see Warnings and Precautions (5.2) Rebound hypertension [see Warnings and Precautions (5.3) Allergic reactions [see Warnings and Precautions (5.4) Cardiac Conduction Abnormalities [see Warnings and Precautions (5.5) . Hypotension/bradycardia [see Warnings and Precautions (5.1) . Sedation and somnolence [see Warnings and Precautions (5.2) . Rebound hypertension [see Warnings and Precautions (5.3) . Allergic reactions [see Warnings and Precautions (5.4) . Cardiac Conduction Abnormalities [see Warnings and Precautions (5.5) . Most common adverse reactions (incidence at least 5% and twice the rate of placebo) as monotherapy in ADHD: somnolence, fatigue, irritability, nightmare, insomnia, constipation, dry mouth. (6.1) Most common adverse reactions (incidence at least 5% and twice the rate of placebo) as adjunct therapy to psychostimulant in ADHD: somnolence, fatigue, decreased appetite, dizziness. 6.1 To report SUSPECTED ADVERSE REACTIONS, contact Par Pharmaceutical at 1-800-828-9393 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch 6.1 Clinical Trial 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.Two clonidine hydrochloride extended-release tablets ADHD clinical studies (Study 1, CLON-301 and Study 2, CLON-302) evaluated 256 patients in two 8-week placebo-controlled studies.Additional pediatric use information for patients ages to 17 years is approved for Concordia Pharmaceuticals, Inc.s KAPVAY(R) (clonidine hydrochloride) extended-release tablets. However, due to Concordia Pharmaceuticals Inc.s marketing exclusivity rights, this drug product is not labeled with that pediatric information.Study 1: Fixed-dose Clonidine Hydrochloride Extended-Release Tablets MonotherapyStudy (CLON-301) was short-term, multi-center, randomized, double-blind, placebo-controlled study of two fixed doses (0.2 mg/day or 0.4 mg/day) of clonidine hydrochloride extended-release tablets in children and adolescents (6 to 17 years of age) who met DSM-IV criteria for ADHD hyperactive or combined inattentive/hyperactive subtypes.Most Common Adverse Reactions (incidence of >= 5% and at least twice the rate of placebo): somnolence, fatigue, irritability, insomnia, nightmare, constipation, dry mouth.Adverse Events Leading to Discontinuation of Clonidine Hydrochloride Extended-Release Tablets -Five patients (7%) in the low dose group (0.2 mg), 15 patients (20%) in the high dose group (0.4 mg), and patient in the placebo group (1%) reported adverse reactions that led to discontinuation. The most common adverse reactions that led to discontinuation were somnolence and fatigue.Commonly observed adverse reactions (incidence of >= 2% in either active treatment group and greater than the rate on placebo) during the treatment period are listed in Table 2.Table Common Adverse Reactions in the Fixed-Dose Monotherapy Trial Treatment Period (Study 1) Percentage of Patients Reporting Event Clonidine Hydrochloride Extended-Release Tablets Clonidine Hydrochloride Extended-Release Tablets Placebo Preferred Term 0.2 mg/day 0.4 mg/day (N=76) N=76 N=78 PSYCHIATRIC DISORDERS Somnolence 38% 31% 4% Nightmare 4% 9% 0% Emotional Disorder 4% 4% 1% Aggression 3% 1% 0% Tearfulness 1% 3% 0% Enuresis 0% 4% 0% Sleep Terror 3% 0% 0% Poor Quality Sleep 0% 3% 1% NERVOUS SYSTEM DISORDERS Headache 20% 13% 16% Insomnia 5% 6% 1% Tremor 1% 4% 0% Abnormal Sleep-Related Event 3% 1% 0% GASTROINTESTINAL DISORDERS Upper Abdominal Pain 15% 10% 12% Nausea 4% 5% 3% Constipation 1% 6% 0% Dry Mouth 0% 5% 1% GENERAL DISORDERS Fatigue+ 16% 13% 1% Irritability 9% 5% 4% CARDIAC DISORDERS Dizziness 7% 3% 5% Bradycardia 0% 4% 0% INVESTIGATIONS Increased Heart Rate 0% 3% 0% METABOLISM AND NUTRITION DISORDERS Decreased Appetite 3% 4% 4% Somnolence includes the terms somnolence and sedation.+ Fatigue includes the terms fatigue and lethargy.Commonly observed adverse reactions (incidence of >= 2% in either active treatment group and greater than the rate on placebo) during the taper period are listed in Table 3.Table Common Adverse Reactions in the Fixed-Dose Monotherapy Trial Taper Period (Study 1) Percentage of Patients Reporting Event Clonidine Hydrochloride Extended-Release Tablets Clonidine Hydrochloride Extended-Release Tablets Preferred Term 0.2 mg/day 0.4 mg/day Placebo N=76 N=78 (N=76) Abdominal Pain Upper 0% 6% 3% Headache 5% 2% 3% Gastrointestinal Viral 0% 5% 0% Somnolence 2% 3% 0% Heart Rate Increased 0% 3% 0% Otitis Media Acute 3% 0% 0% Taper Period: 0.2 mg dose, week 8; 0.4 mg dose, weeks to 8; Placebo dose, weeks to 8Study 2: Flexible-dose Clonidine Hydrochloride Extended-Release Tablets as Adjunctive Therapy to PsychostimulantsStudy (CLON-302) was short-term, randomized, double-blind, placebo-controlled study of flexible dose of clonidine hydrochloride extended-release tablets as adjunctive therapy to psychostimulant in children and adolescents (6 to 17 years) who met DSM-IV criteria for ADHD hyperactive or combined inattentive/hyperactive subtypes, during which clonidine hydrochloride extended-release tablets was initiated at 0.1 mg/day and titrated up to 0.4 mg/day over 3-week period. Most clonidine hydrochloride extended-release tablets treated patients (75.5%) were escalated to the maximum dose of 0.4 mg/day.Most Common Adverse Reactions (incidence of >= 5% and at least twice the rate of placebo): somnolence, fatigue, decreased appetite, dizziness.Adverse Events Leading to Discontinuation There was one patient in the CLON+STM group (1%) who discontinued because of an adverse event (severe bradyphrenia, with severe fatigue).Commonly observed adverse reactions (incidence of >= 2% in the treatment group and greater than the rate on placebo) during the treatment period are listed in Table 4.Table Common Adverse Reactions in the Flexible-Dose Adjunctive to Stimulant Therapy Trial Treatment Period (Study 2) Percentage of Patients Reporting Event Clonidine Hydrochloride Extended-Release Tablets STM PBO STM Preferred Term (N=102) (N=96) PSYCHIATRIC DISORDERS Somnolence 19% 7% Aggression 2% 1% Affect Lability 2% 1% Emotional Disorder 2% 0% GENERAL DISORDERS Fatigue+ 14% 4% Irritability 2% 7% NERVOUS SYSTEM DISORDERS Headache 7% 12% Insomnia 4% 3% GASTROINTESTINAL DISORDERS Upper Abdominal Pain 7% 4% RESPIRATORY DISORDERS Nasal Congestion 2% 2% METABOLISM AND NUTRITION DISORDERS Decreased Appetite 6% 3% CARDIAC DISORDERS Dizziness 5% 1% Somnolence includes the terms: somnolence and sedation.+ Fatigue includes the terms fatigue and lethargy.Commonly observed adverse reactions (incidence of >= 2% in the treatment group and greater than the rate on placebo) during the taper period are listed in Table 5.Table Common Adverse Reactions in the Flexible-Dose Adjunctive to Stimulant Therapy Trial Taper Period (Study 2) Percentage of Patients Reporting Event Clonidine Hydrochloride Extended-Release Tablets STM PBO STM Preferred Term (N=102) (N=96) Nasal Congestion 4% 2% Headache 3% 1% Irritability 3% 2% Throat Pain 3% 1% Gastroenteritis Viral 2% 0% Rash 2% 0% Taper Period: weeks to 8Adverse Reactions Leading to DiscontinuationThirteen percent (13%) of patients receiving clonidine hydrochloride extended-release tablets discontinued from the pediatric monotherapy study due to adverse events, compared to 1% in the placebo group. The most common adverse reactions leading to discontinuation of clonidine hydrochloride extended-release tablets monotherapy treated patients were from somnolence/sedation (5%) and fatigue (4%).Effect on Blood Pressure and Heart RateIn patients that completed weeks of treatment in controlled, fixed-dose monotherapy study in pediatric patients, during the treatment period the maximum placebo-subtracted mean change in systolic blood pressure was -4.0 mmHg on clonidine hydrochloride extended-release tablets 0.2 mg/day and -8.8 mmHg on clonidine hydrochloride extended-release tablets 0.4 mg/day. The maximum placebo-subtracted mean change in diastolic blood pressure was -4.0 mmHg on clonidine hydrochloride extended-release tablets 0.2 mg/day and -7.3 mmHg on clonidine hydrochloride extended-release tablets 0.4 mg/day.The maximum placebo-subtracted mean change in heart rate was -4.0 beats per minute on clonidine hydrochloride extended-release tablets 0.2 mg/day and -7.7 beats per minute on clonidine hydrochloride extended-release tablets 0.4 mg/day.During the taper period of the fixed-dose monotherapy study the maximum placebo-subtracted mean change in systolic blood pressure was +3.4 mmHg on clonidine hydrochloride extended-release tablets 0.2 mg/day and -5.6 mmHg on clonidine hydrochloride extended-release tablets 0.4 mg/day. The maximum placebo-subtracted mean change in diastolic blood pressure was +3.3 mmHg on clonidine hydrochloride extended-release tablets 0.2 mg/day and -5.4 mmHg on clonidine hydrochloride extended-release tablets 0.4 mg/day. The maximum placebo-subtracted mean change in heart rate was -0.6 beats per minute on clonidine hydrochloride extended-release tablets 0.2 mg/day and -3.0 beats per minute on clonidine hydrochloride extended-release tablets 0.4 mg/day.. 6.2 Postmarketing Experience. The following adverse reactions have been identified during post-approval use of clonidine hydrochloride extended-release tablets. 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. These events exclude those already mentioned in 6.1:Psychiatric: hallucinationsCardiovascular: Q-T prolongation.

CLINICAL PHARMACOLOGY SECTION.

12 CLINICAL PHARMACOLOGY. 12.1 Mechanism of Action. Clonidine stimulates alpha2-adrenergic receptors in the brain. Clonidine is not central nervous system stimulant. The mechanism of action of clonidine in ADHD is not known.. 12.2 Pharmacodynamics. Clonidine is known antihypertensive agent. By stimulating alpha2-adrenergic receptors in the brain stem, clonidine reduces sympathetic outflow from the central nervous system and decreases peripheral resistance, renal vascular resistance, heart rate, and blood pressure.. 12.3 Pharmacokinetics. Single-dose Pharmacokinetics in AdultsImmediate-release clonidine hydrochloride and clonidine hydrochloride extended-release tablets have different pharmacokinetic characteristics; dose substitution on milligram for milligram basis will result in differences in exposure. comparison across studies suggests that the Cmax is 50% lower for clonidine hydrochloride extended-release tablets compared to immediate-release clonidine hydrochloride.Following oral administration of an immediate release formulation, plasma clonidine concentration peaks in approximately to hours and the plasma half- life ranges from 12 to 16 hours. The half-life increases up to 41 hours in patients with severe impairment of renal function. Following oral administration about 40 to 60% of the absorbed dose is recovered in the urine as unchanged drug in 24 hours.About 50% of the absorbed dose is metabolized in the liver. Although studies of the effect of renal impairment and studies of clonidine excretion have not been performed with clonidine hydrochloride extended-release tablets, results are likely to be similar to those of the immediate release formulation.The pharmacokinetic profile of clonidine hydrochloride extended-release tablets administration was evaluated in an open-label, three-period, randomized, crossover study of 15 healthy adult subjects who received three single-dose regimens of clonidine: 0.1 mg of clonidine hydrochloride extended-release tablets under fasted conditions, 0.1 mg of clonidine hydrochloride extended-release tablets following high fat meal, and 0.1 mg of clonidine immediate-release (Catapres(R)) under fasted conditions. Treatments were separated by one-week washout periods.Mean concentration-time data from the treatments are shown in Table and Figure 1. After administration of clonidine hydrochloride extended-release tablets, maximum clonidine concentrations were approximately 50% of the Catapres(R) maximum concentrations and occurred approximately hours later relative to Catapres(R). Similar elimination half-lives were observed and total systemic bioavailability following clonidine hydrochloride extended-release tablets was approximately 89% of that following Catapres(R).Food had no effect on plasma concentrations, bioavailability, or elimination half-life.Table Pharmacokinetic Parameters of Clonidine in Healthy Adult Volunteers CATAPRES(R) Fasted Clonidine Hydrochloride Extended-Release Tablets Fed Clonidine Hydrochloride Extended-Release Tablets Fasted n=15 n=15 n=14 Parameter Mean SD Mean SD MEAN SD Cmax (pg/mL) 443 59.6 235 34.7 258 33.3 AUCinf (hrpg/mL) 7313 1812 6505 1728 6729 1650 hTmax (hr) 2.07 0.5 6.80 3.61 6.50 1.23 T1/2 (hr) 12.57 3.11 12.67 3.76 12.65 3.56 Figure 1: Mean Clonidine Concentration Time Profiles after Single Dose AdministrationMultiple-dose Pharmacokinetics in Children and AdolescentsPlasma clonidine concentrations in children and adolescents (0.1 mg bid and 0.2 mg bid) with ADHD are greater than those of adults with hypertension with children and adolescents receiving higher doses on mg/kg basis. Body weight normalized clearance (CL/F) in children and adolescents was higher than CL/F observed in adults with hypertension. Clonidine concentrations in plasma increased with increases in dose over the dose range of 0.2 to 0.4 mg/day. Clonidine CL/F was independent of dose administered over the 0.2 to 0.4 mg/day dose range. Clonidine CL/F appeared to decrease slightly with increases in age over the range of to 17 years, and females had 23% lower CL/F than males. The incidence of sedation-like AEs (somnolence and fatigue) appeared to be independent of clonidine dose or concentration within the studied dose range in the titration study. Results from the add-on study showed that clonidine CL/F was 11% higher in patients who were receiving methylphenidate and 44% lower in those receiving amphetamine compared to subjects not on adjunctive therapy.. Figure-1.

CLINICAL STUDIES SECTION.

14 CLINICAL STUDIES. Efficacy of clonidine hydrochloride extended-release tablets in the treatment of ADHD was established in children and adolescents (6 to 17 years) in:One short-term, placebo-controlled monotherapy trial (Study 1)One short-term adjunctive therapy to psychostimulants trial (Study 2)Short-term Monotherapy and Adjunctive Therapy to Psychostimulant Studies for ADHDThe efficacy of clonidine hydrochloride extended-release tablets in the treatment of ADHD was established in (one monotherapy and one adjunctive therapy) placebo-controlled trials in pediatric patients aged to 17, who met DSM-IV criteria of ADHD hyperactive or combined hyperactive/inattentive subtypes. Signs and symptoms of ADHD were evaluated using the investigator administered and scored ADHD Rating Scale-IV-Parent Version (ADHDRS-IV) total score including hyperactive/impulsivity and inattentive subscales.Study (CLON-301), was an 8-week randomized, double-blind, placebo-controlled, fixed dose study of children and adolescents aged to 17 (N=236) with 5-week primary efficacy endpoint. Patients were randomly assigned to one of the following three treatment groups: clonidine hydrochloride extended-release tablets (CLON) 0.2 mg/day (N=78), clonidine hydrochloride extended-release tablets 0.4 mg/day (N=80), or placebo (N=78). Dosing for the clonidine hydrochloride extended-release tablets groups started at 0.1 mg/day and was titrated in increments of 0.1 mg/week to their respective dose (as divided doses). Patients were maintained at their dose for minimum of weeks before being gradually tapered down to 0.1 mg/day at the last week of treatment. At both doses, improvements in ADHD symptoms were statistically significantly superior in clonidine hydrochloride extended-release tablet-treated patients compared with placebo-treated patients at the end of weeks as measured by the ADHDRS-IV total score (Table 8).Study (CLON-302) was an 8-week randomized, double-blind, placebo-controlled, flexible dose study in children and adolescents aged to 17 (N=198) with 5-week primary efficacy end point. Patients had been treated with psychostimulant (methylphenidate or amphetamine) for four weeks with inadequate response. Patients were randomly assigned to one of two treatment groups: clonidine hydrochloride extended-release tablets adjunct to psychostimulant (N=102) or psychostimulant alone (N=96). The clonidine hydrochloride extended-release tablets dose was initiated at 0.1 mg/day and doses were titrated in increments of 0.1 mg/week up to 0.4 mg/day, as divided doses, over 3-week period based on tolerability and clinical response. The dose was maintained for minimum of weeks before being gradually tapered to 0.1 mg/day at the last week of treatment. ADHD symptoms were statistically significantly improved in clonidine hydrochloride extended-release tablets plus stimulant group compared with the stimulant alone group at the end of weeks as measured by the ADHDRS-IV total score (Table 8).Table Short-Term Trials Study Number Treatment Group Primary Efficacy Measure: ADHDRS-IV Total Score Mean Baseline Score LS Mean Change from Placebo-subtracted (SD) Baseline (SE) Differencea (95% CI) Study Clonidine Hydrochloride Extended-Release Tablets (0.2 mg/day) 43.8 (7.47) -15.0 (1.38) -8.5 (-12.2, 4.8) Clonidine Hydrochloride Extended-Release Tablets (0.4 mg/day) 44.6 (7.73) -15.6 (1.33) -9.1 (-12.8, 5.5) Placebo 45.0 (8.53) -6.5 (1.35) -- Study Clonidine Hydrochloride Extended-Release Tablets (0.4 mg/day) Psychostimulant 38.9 (6.95) -15.8 (1.18) -4.5 (-7.8, -1.1) Psychostimulant alone 39.0 (7.68) -11.3 (1.24) -- SD: standard deviation; SE: standard error;LS Mean: least-squares mean; CI: unadjusted confidence interval.a Difference (drug minus placebo) in least-squares mean change from baseline.Additional pediatric use information for patients ages to 17 years is approved for Concordia Pharmaceuticals, Inc.s KAPVAY(R) (clonidine hydrochloride) extended-release tablets. However, due to Concordia Pharmaceuticals Inc.s marketing exclusivity rights, this drug product is not labeled with that pediatric information.. One short-term, placebo-controlled monotherapy trial (Study 1). One short-term adjunctive therapy to psychostimulants trial (Study 2).

DOSAGE & ADMINISTRATION SECTION.

2 DOSAGE AND ADMINISTRATION. Start with one 0.1 mg tablet at bedtime for one week. Increase daily dosage in increments of 0.1 mg/day at weekly intervals until the desired response is achieved. Take twice day, with either an equal or higher split dosage being given at bedtime, as depicted below (2.2) Total Daily Dose Morning Dose Bedtime Dose 0.1 mg/day 0.1 mg 0.2 mg/day 0.1 mg 0.1 mg 0.3 mg/day 0.1 mg 0.2 mg 0.4 mg/day 0.2 mg 0.2 mg Do not crush, chew or break tablet before swallowing. (2.1) Do not substitute for other clonidine products on mg-per-mg basis, because of differing pharmacokinetic profiles. (2.1) When discontinuing, taper the dose in decrements of no more than 0.1 mg every to days to avoid rebound hypertension. (2.3) Start with one 0.1 mg tablet at bedtime for one week. Increase daily dosage in increments of 0.1 mg/day at weekly intervals until the desired response is achieved. Take twice day, with either an equal or higher split dosage being given at bedtime, as depicted below (2.2) Do not crush, chew or break tablet before swallowing. (2.1) Do not substitute for other clonidine products on mg-per-mg basis, because of differing pharmacokinetic profiles. (2.1) When discontinuing, taper the dose in decrements of no more than 0.1 mg every to days to avoid rebound hypertension. (2.3) 2.1 General Dosing Information. Clonidine Hydrochloride Extended-Release Tablets are an extended-release tablet to be taken orally with or without food. Swallow tablets whole. Do not crush, chew, or break tablets because this will increase the rate of clonidine release. Due to the lack of controlled clinical trial data and differing pharmacokinetic profiles, substitution of clonidine hydrochloride extended-release tablets for other clonidine products on mg-per-mg basis is not recommended [see Clinical Pharmacology (12.3) ].. 2.2 Dose Selection. The dose of clonidine hydrochloride extended-release tablets, administered either as monotherapy or as adjunctive therapy to psychostimulant, should be individualized according to the therapeutic needs and response of the patient. Dosing should be initiated with one 0.1 mg tablet at bedtime, and the daily dosage should be adjusted in increments of 0.1 mg/day at weekly intervals until the desired response is achieved. Doses should be taken twice day, with either an equal or higher split dosage being given at bedtime (see Table 1).Table Clonidine Hydrochloride Extended-Release Tablets Dosing Guidance Total Daily Dose Morning Dose Bedtime Dose 0.1 mg/day 0.1 mg 0.2 mg/day 0.1 mg 0.1 mg 0.3 mg/day 0.1 mg 0.2 mg 0.4 mg/day 0.2 mg 0.2 mg Doses of clonidine hydrochloride extended-release tablets higher than 0.4 mg/day (0.2 mg twice daily) were not evaluated in clinical trials for ADHD and are not recommended.When clonidine hydrochloride extended-release tablets is being added-on to psychostimulant, the dose of the psychostimulant can be adjusted depending on the patients response to clonidine hydrochloride extended-release tablets.. 2.3 Discontinuation. When discontinuing clonidine hydrochloride extended-release tablets, the total daily dose should be tapered in decrements of no more than 0.1 mg every to days to avoid rebound hypertension [see Warnings and Precautions (5.3) ]. 2.4 Missed Doses. If patients miss dose of clonidine hydrochloride extended-release tablets, they should skip that dose and take the next dose as scheduled. Do not take more than the prescribed total daily amount of clonidine hydrochloride extended-release tablets in any 24-hour period.

PATIENT MEDICATION INFORMATION SECTION.

Patient Information. Clonidine Hydrochloride (kloe ni deen hye droe klor ide) Extended-Release TabletsRead the Patient Information that comes with clonidine hydrochloride extended-release tablets before you start taking it and each time you get refill. There may be new information. This Patient Information leaflet does not take the place of talking to your doctor about your medical condition or treatment.What are clonidine hydrochloride extended-release tabletsClonidine hydrochloride extended-release tablets are prescription medicine used for the treatment of Attention-Deficit Hyperactivity Disorder (ADHD). Your doctor may prescribe clonidine hydrochloride extended-release tablets alone or together with certain other ADHD medicines.Clonidine hydrochloride extended-release tablets are not central nervous system (CNS) stimulant.Clonidine hydrochloride extended-release tablets should be used as part of total treatment program for ADHD that may include counseling or other therapies.Who should not take clonidine hydrochloride extended-release tabletsDo not take clonidine hydrochloride extended-release tablets if you are allergic to clonidine in clonidine hydrochloride extended-release tablets. See the end of this leaflet for complete list of ingredients in clonidine hydrochloride extended-release tablets.What should tell my doctor before taking clonidine hydrochloride extended-release tabletsBefore you take clonidine hydrochloride extended-release tablets, tell your doctor if you:have kidney problemshave low or high blood pressurehave history of passing out (syncope)have heart problems, including history of heart attackhave had stroke or have stroke symptomshad skin reaction (such as rash) after taking clonidine in transdermal form (skin patch)have any other medical conditionsare pregnant or plan to become pregnant. It is not known if clonidine hydrochloride extended-release tablets will harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant.are breastfeeding or plan to breastfeed. Clonidine hydrochloride extended-release tablets can pass into your breast milk. Talk to your doctor about the best way to feed your baby if you take clonidine hydrochloride extended-release tablets.Tell your doctor about all of the medicines that you take, including prescription and non-prescription medicines, vitamins, and herbal supplements. Clonidine hydrochloride extended-release tablets and certain other medicines may affect each other causing serious side effects. Sometimes the doses of other medicines may need to be changed while taking clonidine hydrochloride extended-release tablets.Especially tell your doctor if you take:anti-depression medicinesheart or blood pressure medicineother medicines that contain clonidinea medicine that makes you sleepy (sedation)Ask your doctor or pharmacist for list of these medicines, if you are not sure if your medicine is listed above.Know the medicines that you take. Keep list of your medicines with you to show your doctor and pharmacist when you get new medicine.How should take clonidine hydrochloride extended-release tabletsTake clonidine hydrochloride extended-release tablets exactly as your doctor tells you to take it.Your doctor will tell you how many clonidine hydrochloride extended-release tablets to take and when to take them. Your doctor may change your dose of clonidine hydrochloride extended-release tablets. Do not change your dose of clonidine hydrochloride extended-release tablets without talking to your doctor.Do not stop taking clonidine hydrochloride extended-release tablets without talking to your doctor.Clonidine hydrochloride extended-release tablets can be taken with or without food.Clonidine hydrochloride extended-release tablets should be taken times day (in the morning and at bedtime).If you miss dose of clonidine hydrochloride extended-release tablets, skip the missed dose. Just take the next dose at your regular time. Do not take two doses at the same time.Take clonidine hydrochloride extended-release tablets whole. Do not chew, crush or break clonidine hydrochloride extended-release tablets. Tell your doctor if you cannot swallow clonidine hydrochloride extended-release tablets whole. You may need different medicine.If you take too much clonidine hydrochloride extended-release tablets, call your Poison Control Center or go to the nearest hospital emergency room right away.What should avoid while taking clonidine hydrochloride extended-release tabletsDo not drink alcohol or take other medicines that make you sleepy or dizzy while taking clonidine hydrochloride extended-release tablets until you talk with your doctor. Clonidine hydrochloride extended-release tablets taken with alcohol or medicines that cause sleepiness or dizziness may make your sleepiness or dizziness worse.Do not drive, operate heavy machinery or do other dangerous activities until you know how clonidine hydrochloride extended-release tablets will affect you.Avoid becoming dehydrated or overheated.What are possible side effects of clonidine hydrochloride extended-release tablets Clonidine hydrochloride extended-release tablets may cause serious side effects, including:Low blood pressure and low heart rate. Your doctor should check your heart rate and blood pressure before starting treatment and regularly during treatment with clonidine hydrochloride extended-release tablets.Sleepiness.Withdrawal symptoms. Suddenly stopping clonidine hydrochloride extended-release tablets may cause withdrawal symptoms including: increased blood pressure, headache, increased heart rate, lightheadedness, tightness in your chest and nervousness.The most common side effects of clonidine hydrochloride extended-release tablets include:sleepinesstirednessirritabilitytrouble sleeping (insomnia)nightmareconstipationdry mouthdecreased appetitedizzinessTell your doctor if you have any side effects that bother you or that does not go away.These are not all of the possible side effects of clonidine hydrochloride extended-release 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 should store clonidine hydrochloride extended-release tabletsStore clonidine hydrochloride extended-release tablets at 20o to 25oC (68 to 77F) [see USP Controlled Room Temperature].Keep clonidine hydrochloride extended-release tablets in tightly closed container.Keep clonidine hydrochloride extended-release tablets and all medicines out of the reach of children. General information about the safe and effective use of clonidine hydrochloride extended-release tabletsMedicines are sometimes prescribed for purposes other than those listed in Patient Information leaflet. Do not use clonidine hydrochloride extended-release tablets for condition for which it was not prescribed.Do not give clonidine hydrochloride extended-release tablets to other people, even if they have the same symptoms that you have. It may harm them.This Patient Information leaflet summarizes the most important information about clonidine hydrochloride extended-release tablets. If you would like more information, talk with your doctor. You can also ask your doctor or pharmacist for information about clonidine hydrochloride extended-release tablets that is written for healthcare professionals.What are the ingredients in clonidine hydrochloride extended-release tabletsActive Ingredient: clonidine hydrochlorideInactive Ingredients: colloidal silicon dioxide, hydroxypropyl cellulose, hypromellose, magnesium stearate, microcrystalline cellulose and sodium lauryl sulfateRx onlyKAPVAY(R) is registered trademark of Concordia Pharmaceuticals, Inc. and the brands listed are trademarks of their respective owners.Manufactured by:Par PharmaceuticalChestnut Ridge, NY 10977R09/16 OS257A-01-50-04. Clonidine hydrochloride extended-release tablets are not central nervous system (CNS) stimulant.. Clonidine hydrochloride extended-release tablets should be used as part of total treatment program for ADHD that may include counseling or other therapies.. Do not take clonidine hydrochloride extended-release tablets if you are allergic to clonidine in clonidine hydrochloride extended-release tablets. See the end of this leaflet for complete list of ingredients in clonidine hydrochloride extended-release tablets.. have kidney problems. have low or high blood pressure. have history of passing out (syncope). have heart problems, including history of heart attack. have had stroke or have stroke symptoms. had skin reaction (such as rash) after taking clonidine in transdermal form (skin patch). have any other medical conditions. are pregnant or plan to become pregnant. It is not known if clonidine hydrochloride extended-release tablets will harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant.. are breastfeeding or plan to breastfeed. Clonidine hydrochloride extended-release tablets can pass into your breast milk. Talk to your doctor about the best way to feed your baby if you take clonidine hydrochloride extended-release tablets.. anti-depression medicines. heart or blood pressure medicine. other medicines that contain clonidine. medicine that makes you sleepy (sedation). Take clonidine hydrochloride extended-release tablets exactly as your doctor tells you to take it.. Your doctor will tell you how many clonidine hydrochloride extended-release tablets to take and when to take them. Your doctor may change your dose of clonidine hydrochloride extended-release tablets. Do not change your dose of clonidine hydrochloride extended-release tablets without talking to your doctor.. Do not stop taking clonidine hydrochloride extended-release tablets without talking to your doctor.. Clonidine hydrochloride extended-release tablets can be taken with or without food.. Clonidine hydrochloride extended-release tablets should be taken times day (in the morning and at bedtime).. If you miss dose of clonidine hydrochloride extended-release tablets, skip the missed dose. Just take the next dose at your regular time. Do not take two doses at the same time.. Take clonidine hydrochloride extended-release tablets whole. Do not chew, crush or break clonidine hydrochloride extended-release tablets. Tell your doctor if you cannot swallow clonidine hydrochloride extended-release tablets whole. You may need different medicine.. If you take too much clonidine hydrochloride extended-release tablets, call your Poison Control Center or go to the nearest hospital emergency room right away.. Do not drink alcohol or take other medicines that make you sleepy or dizzy while taking clonidine hydrochloride extended-release tablets until you talk with your doctor. Clonidine hydrochloride extended-release tablets taken with alcohol or medicines that cause sleepiness or dizziness may make your sleepiness or dizziness worse.. Do not drive, operate heavy machinery or do other dangerous activities until you know how clonidine hydrochloride extended-release tablets will affect you.. Avoid becoming dehydrated or overheated.. Low blood pressure and low heart rate. Your doctor should check your heart rate and blood pressure before starting treatment and regularly during treatment with clonidine hydrochloride extended-release tablets.. Sleepiness.. Withdrawal symptoms. Suddenly stopping clonidine hydrochloride extended-release tablets may cause withdrawal symptoms including: increased blood pressure, headache, increased heart rate, lightheadedness, tightness in your chest and nervousness.. sleepiness. tiredness. irritability. trouble sleeping (insomnia). nightmare. constipation. dry mouth. decreased appetite. dizziness. Store clonidine hydrochloride extended-release tablets at 20o to 25oC (68 to 77F) [see USP Controlled Room Temperature].. Keep clonidine hydrochloride extended-release tablets in tightly closed container.. Active Ingredient: clonidine hydrochloride. Inactive Ingredients: colloidal silicon dioxide, hydroxypropyl cellulose, hypromellose, magnesium stearate, microcrystalline cellulose and sodium lauryl sulfate.

PEDIATRIC USE SECTION.

8.4 Pediatric Use. The safety and efficacy of clonidine hydrochloride extended-release tablets in the treatment of ADHD have been established in pediatric patients to 17 years of age. Use of clonidine hydrochloride extended-release tablets in pediatric patients to 17 years of age is supported by short-term, placebo controlled monotherapy trial, and short-term adjunctive therapy trial [see CLINICAL STUDIES (14) ]. Safety and efficacy in pediatric patients below the age of years has not been established.Additional pediatric use information for patients ages to 17 years is approved for Concordia Pharmaceuticals, Inc.s KAPVAY(R) (clonidine hydrochloride) extended-release tablets. However, due to Concordia Pharmaceuticals Inc.s marketing exclusivity rights, this drug product is not labeled with that pediatric information.Juvenile Animal DataIn studies in juvenile rats, clonidine hydrochloride alone or in combination with methylphenidate had an effect on bone growth at clinically relevant doses and produced slight delay in sexual maturation in males at times the maximum recommended human dose (MRHD) for clonidine and methylphenidate.In study where juvenile rats were treated orally with clonidine hydrochloride from day 21 of age to adulthood, slight delay in onset of preputial separation (delayed sexual maturation) was seen in males treated with 300 mcg/kg/day, which is approximately times the MRHD of 0.4 mg/day on mg/m2 basis. The no-effect dose was 100 mcg/kg/day, which is approximately equal to the MRHD. There was no drug effects on fertility or on other measures of sexual or neurobehavioral development. In study where juvenile rats were treated with clonidine alone (300 mcg/kg/day) or in combination with methylphenidate (10 mg/kg/day in females and 50/30 mg/kg/day in males; the dose was lowered from 50 to 30 mg/kg/day in males due to self-injurious behavior during the first week of treatment) from day 21 of age to adulthood, decreases in bone mineral density and mineral content were observed in males treated with 300 mcg/kg/day clonidine alone and in combination with 50/30 mg/kg/day methylphenidate and decrease in femur length was observed in males treated with the combination at the end of the treatment period. These doses are approximately times the MRHD of 0.4 mg/day clonidine and 54 mg/day methylphenidate on mg/m2 basis. All these effects in males were not reversed at the end of 4-week recovery period. In addition, similar findings were seen in males treated with lower dose of clonidine (30 mcg/kg/day) in combination with 50 mg/kg/day of methylphenidate and decrease in femur length was observed in females treated with clonidine alone at the end of the recovery period. These effects were accompanied by decrease in body weight gain in treated animals during the treatment period but the effect was reversed at the end of the recovery period. delay in preputial separation (sexual maturation) was observed in males treated with the combination treatment of 300 mcg/kg/day clonidine and 50/30 mg/kg/day methylphenidate. There was no effect on reproduction or sperm analysis in these males.

PHARMACOKINETICS SECTION.

12.3 Pharmacokinetics. Single-dose Pharmacokinetics in AdultsImmediate-release clonidine hydrochloride and clonidine hydrochloride extended-release tablets have different pharmacokinetic characteristics; dose substitution on milligram for milligram basis will result in differences in exposure. comparison across studies suggests that the Cmax is 50% lower for clonidine hydrochloride extended-release tablets compared to immediate-release clonidine hydrochloride.Following oral administration of an immediate release formulation, plasma clonidine concentration peaks in approximately to hours and the plasma half- life ranges from 12 to 16 hours. The half-life increases up to 41 hours in patients with severe impairment of renal function. Following oral administration about 40 to 60% of the absorbed dose is recovered in the urine as unchanged drug in 24 hours.About 50% of the absorbed dose is metabolized in the liver. Although studies of the effect of renal impairment and studies of clonidine excretion have not been performed with clonidine hydrochloride extended-release tablets, results are likely to be similar to those of the immediate release formulation.The pharmacokinetic profile of clonidine hydrochloride extended-release tablets administration was evaluated in an open-label, three-period, randomized, crossover study of 15 healthy adult subjects who received three single-dose regimens of clonidine: 0.1 mg of clonidine hydrochloride extended-release tablets under fasted conditions, 0.1 mg of clonidine hydrochloride extended-release tablets following high fat meal, and 0.1 mg of clonidine immediate-release (Catapres(R)) under fasted conditions. Treatments were separated by one-week washout periods.Mean concentration-time data from the treatments are shown in Table and Figure 1. After administration of clonidine hydrochloride extended-release tablets, maximum clonidine concentrations were approximately 50% of the Catapres(R) maximum concentrations and occurred approximately hours later relative to Catapres(R). Similar elimination half-lives were observed and total systemic bioavailability following clonidine hydrochloride extended-release tablets was approximately 89% of that following Catapres(R).Food had no effect on plasma concentrations, bioavailability, or elimination half-life.Table Pharmacokinetic Parameters of Clonidine in Healthy Adult Volunteers CATAPRES(R) Fasted Clonidine Hydrochloride Extended-Release Tablets Fed Clonidine Hydrochloride Extended-Release Tablets Fasted n=15 n=15 n=14 Parameter Mean SD Mean SD MEAN SD Cmax (pg/mL) 443 59.6 235 34.7 258 33.3 AUCinf (hrpg/mL) 7313 1812 6505 1728 6729 1650 hTmax (hr) 2.07 0.5 6.80 3.61 6.50 1.23 T1/2 (hr) 12.57 3.11 12.67 3.76 12.65 3.56 Figure 1: Mean Clonidine Concentration Time Profiles after Single Dose AdministrationMultiple-dose Pharmacokinetics in Children and AdolescentsPlasma clonidine concentrations in children and adolescents (0.1 mg bid and 0.2 mg bid) with ADHD are greater than those of adults with hypertension with children and adolescents receiving higher doses on mg/kg basis. Body weight normalized clearance (CL/F) in children and adolescents was higher than CL/F observed in adults with hypertension. Clonidine concentrations in plasma increased with increases in dose over the dose range of 0.2 to 0.4 mg/day. Clonidine CL/F was independent of dose administered over the 0.2 to 0.4 mg/day dose range. Clonidine CL/F appeared to decrease slightly with increases in age over the range of to 17 years, and females had 23% lower CL/F than males. The incidence of sedation-like AEs (somnolence and fatigue) appeared to be independent of clonidine dose or concentration within the studied dose range in the titration study. Results from the add-on study showed that clonidine CL/F was 11% higher in patients who were receiving methylphenidate and 44% lower in those receiving amphetamine compared to subjects not on adjunctive therapy.. Figure-1.

USE IN SPECIFIC POPULATIONS SECTION.

8 USE IN SPECIFIC POPULATIONS. Based on animal data, clonidine hydrochloride extended-release tablets may cause fetal harm. (8.1) Renal Impairment: The dosage of clonidine hydrochloride extended-release tablets must be adjusted according to the degree of impairment, and patients should be carefully monitored. (8.6, 12.3) Based on animal data, clonidine hydrochloride extended-release tablets may cause fetal harm. (8.1) Renal Impairment: The dosage of clonidine hydrochloride extended-release tablets must be adjusted according to the degree of impairment, and patients should be carefully monitored. (8.6, 12.3) 8.1 Pregnancy. Pregnancy Category C:Risk SummaryThere are no adequate or well-controlled studies with clonidine hydrochloride extended-release tablets in pregnant women. In animal embryofetal studies, increased resorptions were seen in rats and mice administered oral clonidine hydrochloride from implantation through organogenesis at 10 and times, respectively, the maximum recommended human dose (MRHD). No embryotoxic or teratogenic effects were seen in rabbits administered oral clonidine hydrochloride during organogenesis at doses up to times the MRHD. Clonidine hydrochloride extended-release tablets should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.Animal DataOral administration of clonidine hydrochloride to pregnant rabbits during the period of embryo/fetal organogenesis at doses of up to 80 mcg/kg/day (approximately times the oral maximum recommended daily dose [MRHD] of 0.4 mg/day on mg/m2 basis) produced no evidence of teratogenic or embryotoxic potential. In pregnant rats, however, doses as low as 15 mcg/kg/day (1/3 the MRHD on mg/m2 basis) were associated with increased resorptions in study in which dams were treated continuously from months prior to mating and throughout gestation. Increased resorptions were not associated with treatment at the same or at higher dose levels (up to times the MRHD) when treatment of the dams was restricted to gestation days to 15. Increases in resorptions were observed in both rats and mice at 500 mcg/kg/day (10 and times the MRHD in rats and mice, respectively) or higher when the animals were treated on gestation days to 14; 500 mcg/kg/day was the lowest dose employed in this study.. 8.3 Nursing Mothers. Clonidine hydrochloride is present in human milk. The developmental and health benefits of breastfeeding should be considered along with the mothers clinical need for clonidine hydrochloride extended-release tablets and any potential adverse effects on the breastfed child from clonidine hydrochloride extended-release tablets or from the underlying maternal condition. Exercise caution when clonidine hydrochloride extended-release tablets are administered to nursing woman.. 8.4 Pediatric Use. The safety and efficacy of clonidine hydrochloride extended-release tablets in the treatment of ADHD have been established in pediatric patients to 17 years of age. Use of clonidine hydrochloride extended-release tablets in pediatric patients to 17 years of age is supported by short-term, placebo controlled monotherapy trial, and short-term adjunctive therapy trial [see CLINICAL STUDIES (14) ]. Safety and efficacy in pediatric patients below the age of years has not been established.Additional pediatric use information for patients ages to 17 years is approved for Concordia Pharmaceuticals, Inc.s KAPVAY(R) (clonidine hydrochloride) extended-release tablets. However, due to Concordia Pharmaceuticals Inc.s marketing exclusivity rights, this drug product is not labeled with that pediatric information.Juvenile Animal DataIn studies in juvenile rats, clonidine hydrochloride alone or in combination with methylphenidate had an effect on bone growth at clinically relevant doses and produced slight delay in sexual maturation in males at times the maximum recommended human dose (MRHD) for clonidine and methylphenidate.In study where juvenile rats were treated orally with clonidine hydrochloride from day 21 of age to adulthood, slight delay in onset of preputial separation (delayed sexual maturation) was seen in males treated with 300 mcg/kg/day, which is approximately times the MRHD of 0.4 mg/day on mg/m2 basis. The no-effect dose was 100 mcg/kg/day, which is approximately equal to the MRHD. There was no drug effects on fertility or on other measures of sexual or neurobehavioral development. In study where juvenile rats were treated with clonidine alone (300 mcg/kg/day) or in combination with methylphenidate (10 mg/kg/day in females and 50/30 mg/kg/day in males; the dose was lowered from 50 to 30 mg/kg/day in males due to self-injurious behavior during the first week of treatment) from day 21 of age to adulthood, decreases in bone mineral density and mineral content were observed in males treated with 300 mcg/kg/day clonidine alone and in combination with 50/30 mg/kg/day methylphenidate and decrease in femur length was observed in males treated with the combination at the end of the treatment period. These doses are approximately times the MRHD of 0.4 mg/day clonidine and 54 mg/day methylphenidate on mg/m2 basis. All these effects in males were not reversed at the end of 4-week recovery period. In addition, similar findings were seen in males treated with lower dose of clonidine (30 mcg/kg/day) in combination with 50 mg/kg/day of methylphenidate and decrease in femur length was observed in females treated with clonidine alone at the end of the recovery period. These effects were accompanied by decrease in body weight gain in treated animals during the treatment period but the effect was reversed at the end of the recovery period. delay in preputial separation (sexual maturation) was observed in males treated with the combination treatment of 300 mcg/kg/day clonidine and 50/30 mg/kg/day methylphenidate. There was no effect on reproduction or sperm analysis in these males.. 8.6 Renal Impairment. The impact of renal impairment on the pharmacokinetics of clonidine in children has not been assessed. The initial dosage of clonidine hydrochloride extended-release tablets should be based on degree of impairment. Monitor patients carefully for hypotension and bradycardia, and titrate to higher doses cautiously. Since only minimal amount of clonidine is removed during routine hemodialysis, there is no need to give supplemental clonidine hydrochloride extended-release tablets following dialysis.

WARNINGS AND PRECAUTIONS SECTION.

5 WARNINGS AND PRECAUTIONS. Hypotension/bradycardia/syncope: Titrate slowly and monitor vital signs frequently in patients at risk for hypotension, heart block, bradycardia, syncope, cardiovascular disease, vascular disease, cerebrovascular disease or chronic renal failure. Measure heart rate and blood pressure prior to initiation of therapy, following dose increases, and periodically while on therapy. Avoid concomitant use of drugs with additive effects unless clinically indicated. Advise patients to avoid becoming dehydrated or overheated. (5.1) Somnolence/Sedation: Has been observed with clonidine hydrochloride extended-release tablets. Consider the potential for additive sedative effects with CNS depressant drugs. Caution patients against operating heavy equipment or driving until they know how they respond to clonidine hydrochloride extended-release tablets. (5.2) Cardiac Conduction Abnormalities: May worsen sinus node dysfunction and atrioventricular (AV) block, especially in patients taking other sympatholytic drugs. Titrate slowly and monitor vital signs frequently. (5.5) Hypotension/bradycardia/syncope: Titrate slowly and monitor vital signs frequently in patients at risk for hypotension, heart block, bradycardia, syncope, cardiovascular disease, vascular disease, cerebrovascular disease or chronic renal failure. Measure heart rate and blood pressure prior to initiation of therapy, following dose increases, and periodically while on therapy. Avoid concomitant use of drugs with additive effects unless clinically indicated. Advise patients to avoid becoming dehydrated or overheated. (5.1) Somnolence/Sedation: Has been observed with clonidine hydrochloride extended-release tablets. Consider the potential for additive sedative effects with CNS depressant drugs. Caution patients against operating heavy equipment or driving until they know how they respond to clonidine hydrochloride extended-release tablets. (5.2) Cardiac Conduction Abnormalities: May worsen sinus node dysfunction and atrioventricular (AV) block, especially in patients taking other sympatholytic drugs. Titrate slowly and monitor vital signs frequently. (5.5) 5.1 Hypotension/Bradycardia. Treatment with clonidine hydrochloride extended-release tablets can cause dose-related decreases in blood pressure and heart rate [see Adverse Reactions (6.1) ]. Measure heart rate and blood pressure prior to initiation of therapy, following dose increases, and periodically while on therapy. Titrate clonidine hydrochloride extended-release tablets slowly in patients with history of hypotension, and those with underlying conditions that may be worsened by hypotension and bradycardia; e.g., heart block, bradycardia, cardiovascular disease, vascular disease, cerebrovascular disease, or chronic renal failure. In patients who have history of syncope or may have condition that predisposes them to syncope, such as hypotension, orthostatic hypotension, bradycardia, or dehydration, advise patients to avoid becoming dehydrated or overheated. Monitor blood pressure and heart rate, and adjust dosages accordingly in patients treated concomitantly with antihypertensives or other drugs that can reduce blood pressure or heart rate or increase the risk of syncope.. 5.2 Sedation and Somnolence. Somnolence and sedation were commonly reported adverse reactions in clinical studies. In patients that completed weeks of therapy in controlled, fixed dose pediatric monotherapy study, 31% of patients treated with 0.4 mg/day and 38% treated with 0.2 mg/day versus 4% of placebo treated patients reported somnolence as an adverse event. In patients that completed weeks of therapy in controlled flexible dose pediatric adjunctive to stimulants study, 19% of patients treated with clonidine hydrochloride extended-release tablets+stimulant versus 7% treated with placebo+stimulant reported somnolence. Before using clonidine hydrochloride extended-release tablets with other centrally active depressants (such as phenothiazines, barbiturates, or benzodiazepines), consider the potential for additive sedative effects. Caution patients against operating heavy equipment or driving until they know how they respond to treatment with clonidine hydrochloride extended-release tablets. Advise patients to avoid use with alcohol.. 5.3 Rebound Hypertension. Abrupt discontinuation of clonidine hydrochloride extended-release tablets can cause rebound hypertension. In adults with hypertension, sudden cessation of clonidine hydrochloride extended-release formulation treatment in the 0.2 to 0.6 mg/day range resulted in reports of headache, tachycardia, nausea, flushing, warm feeling, brief lightheadedness, tightness in chest, and anxiety. In adults with hypertension, sudden cessation of treatment with immediate-release clonidine has, in some cases, resulted in symptoms such as nervousness, agitation, headache, and tremor accompanied or followed by rapid rise in blood pressure and elevated catecholamine concentrations in the plasma.No studies evaluating abrupt discontinuation of clonidine hydrochloride extended-release tablets in children with ADHD have been conducted; however, to minimize the risk of rebound hypertension, gradually reduce the dose of clonidine hydrochloride extended-release tablets in decrements of no more than 0.1 mg every to days. Patients should be instructed not to discontinue clonidine hydrochloride extended-release tablets therapy without consulting their physician due to the potential risk of withdrawal effects.. 5.4 Allergic Reactions. In patients who have developed localized contact sensitization to clonidine transdermal system, continuation of clonidine transdermal system or substitution of oral clonidine hydrochloride extended-release tablets therapy may be associated with the development of generalized skin rash.In patients who develop an allergic reaction from clonidine transdermal system, substitution of oral clonidine hydrochloride extended-release tablets may also elicit an allergic reaction (including generalized rash, urticaria, or angioedema).. 5.5 Cardiac Conduction Abnormalities. The sympatholytic action of clonidine may worsen sinus node dysfunction and atrioventricular (AV) block, especially in patients taking other sympatholytic drugs. There have been post-marketing reports of patients with conduction abnormalities and/or taking other sympatholytic drugs who developed severe bradycardia requiring IV atropine, IV isoproterenol, and temporary cardiac pacing while taking clonidine. Titrate clonidine hydrochloride extended-release tablets slowly and monitor vital signs frequently in patients with cardiac conduction abnormalities or patients concomitantly treated with other sympatholytic drugs.