GLYCOPYRROLATE

Glycopyrrolate oral solution is an anticholinergic drug available as an oral solution containing 1 mg glycopyrrolate per 5 mL. The chemical name for glycopyrrolate is pyrrolidinium, 3-[(cyclopentylhydroxyphenylacetyl) oxy]-1,1-dimethyl-,bromide. The chemical structure is: The empirical formula for glycopyrrolate oral solution is C 19 H 28 BrNO 3 and the molecular weight is 398.33. The inactive ingredients in glycopyrrolate oral solution are: citric acid monohydrate, glycerin, artificial cherry flavor, methylparaben, propylene glycol, propylparaben, saccharin sodium, sodium citrate dihydrate, sorbitol solution, and purified water. Glycopyrrolate Chemical Structure

Glycopyrrolate oral solution is indicated to reduce chronic severe drooling in patients aged 3 to 16 years with neurologic conditions associated with problem drooling (e.g., cerebral palsy). Glycopyrrolate oral solution is an anticholinergic indicated to reduce chronic severe drooling in patients aged 3 to16 years with neurologic conditions associated with problem drooling (e.g., cerebral palsy). ( 1 )

Glycopyrrolate oral solution must be measured and administered with an accurate measuring device [ see Patient Counseling Information ( 17) ]. Initiate dosing at 0.02 mg/kg orally three times daily and titrate in increments of 0.02 mg/kg every 5 to 7 days based on therapeutic response and adverse reactions. The maximum recommended dosage is 0.1 mg/kg three times daily not to exceed 1.5-3 mg per dose based upon weight. For greater detail, see Table 1 . During the four-week titration period, dosing can be increased with the recommended dose titration schedule while ensuring that the anticholinergic adverse events are tolerable. Prior to each increase in dose, review the tolerability of the current dose level with the patient’s caregiver. Glycopyrrolate oral solution should be dosed at least one hour before or two hours after meals. The presence of high fat food reduces the oral bioavailability of glycopyrrolate oral solution if taken shortly after a meal [see Clinical Pharmacology ( 12.3 )] . Table 1: Recommended Dose Titration Schedule (each dose to be given three times daily) Weight Dose Level 1 Dose Level 2 Dose Level 3 Dose Level 4 Dose Level 5 Kg lbs (~0.02 mg/kg) (~0.04 mg/kg) (~0.06 mg/kg) (~0.08 mg/kg) (~0.1 mg/kg) 13-17 27-38 0.3 mg 1.5 mL 0.6 mg 3 mL 0.9 mg 4.5 mL 1.2 mg 6 mL 1.5 mg 7.5 mL 18-22 39-49 0.4 mg 2 mL 0.8 mg 4 mL 1.2 mg 6 mL 1.6 mg 8 mL 2.0 mg 10 mL 23-27 50-60 0.5 mg 2.5 mL 1.0 mg 5 mL 1.5 mg 7.5 mL 2.0 mg 10 mL 2.5 mg 12.5 mL 28-32 61-71 0.6 mg 3 mL 1.2 mg 6 mL 1.8 mg 9 mL 2.4 mg 12 mL 3.0 mg 15 mL 33-37 72-82 0.7 mg 3.5 mL 1.4 mg 7 mL 2.1 mg 10.5 mL 2.8 mg 14 mL 3.0 mg 15 mL 38-42 83-93 0.8 mg 4 mL 1.6 mg 8 mL 2.4 mg 12 mL 3.0 mg 15 mL 3.0 mg 15 mL 43-47 94-104 0.9 mg 4.5 mL 1.8 mg 9 mL 2.7 mg 13.5 mL 3.0 mg 15 mL 3.0 mg 15 mL ≥48 ≥105 1.0 mg 5 mL 2.0 mg 10 mL 3.0 mg 15 mL 3.0 mg 15 mL 3.0 mg 15 mL Initiate dosing at 0.02 mg/kg three times daily and titrate in increments of 0.02 mg/kg every 5 to 7 days, based on therapeutic response and adverse reactions. ( 2 ) Maximum recommended dose is 0.1 mg/kg three times daily, not to exceed 1.5-3 mg per dose based upon weight. ( 2 ) Administer at least one hour before or two hours after meals. ( 2 )

Glycopyrrolate oral solution is contraindicated in: Patients with medical conditions that preclude anticholinergic therapy (e.g., glaucoma, paralytic ileus, unstable cardiovascular status in acute hemorrhage, severe ulcerative colitis, toxic megacolon complicating ulcerative colitis, myasthenia gravis). Patients taking solid oral dosage forms of potassium chloride. The passage of potassium chloride tablets through the gastrointestinal (GI) tract may be arrested or delayed with coadministration of glycopyrrolate oral solution. Medical conditions that preclude anticholinergic therapy. (4) Concomitant use of solid oral dosage forms of potassium chloride. (4)

The following serious adverse reactions are described elsewhere in the labeling: ● Constipation or intestinal pseudo-obstruction [see Warnings and Precautions ( 5.1 )] ● Incomplete mechanical intestinal obstruction [see Warnings and Precautions ( 5.2)] The most common adverse reactions reported with glycopyrrolate oral solution are dry mouth, vomiting, constipation, flushing, and nasal congestion. The most common adverse reactions (incidence ≥30%) are dry mouth, vomiting, constipation, flushing, and nasal congestion. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Endo at 1-800-828-9393 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 a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The data described below reflect exposure to glycopyrrolate oral solution in 151 subjects, including 20 subjects who participated in an 8-week placebo-controlled study (Study 1) and 137 subjects who participated in a 24-week open-label study (six subjects who received glycopyrrolate oral solution in the placebo-controlled study and 131 new subjects). Table 2 presents adverse reactions reported by ≥ 15% of glycopyrrolate oral solution-treated subjects from the placebo-controlled clinical trial. Table 2: Adverse Reactions Occurring in ≥ 15% of Glycopyrrolate oral solution-Treated Subjects and at a Greater Frequency than Placebo in Study 1 Glycopyrrolate oral solution (N=20) n (%) Placebo (N=18) n (%) Dry Mouth 8 (40%) 2 (11%) Vomiting 8 (40%) 2 (11%) Constipation 7 (35%) 4 (22%) Flushing 6 (30%) 3 (17%) Nasal Congestion 6 (30%) 2 (11%) Headache 3 (15%) 1 (6%) Sinusitis 3 (15%) 1 (6%) Upper Respiratory Tract Infection 3 (15%) 0 Urinary Retention 3 (15%) 0 The following adverse reactions occurred at a rate of <2% of patients receiving glycopyrrolate oral solution in the open-label study. Gastrointestinal: Abdominal distention, abdominal pain, stomach discomfort, chapped lips, flatulence, retching, dry tongue General Disorders: Irritability, pain Infections: Pneumonia, sinusitis, tracheostomy infection, upper respiratory tract infection, urinary tract infection Investigations: Heart rate increase Metabolism and Nutrition: Dehydration Nervous System: Headache, convulsion, dysgeusia, nystagmus Psychiatric: Agitation, restlessness, abnormal behavior, aggression, crying, impulse control disorder, moaning, mood altered Respiratory: Increased viscosity of bronchial secretion, nasal congestion, nasal dryness Skin: Dry skin, pruritus, rash Vascular: Pallor 6.2 Postmarketing Experience The following adverse reactions have been identified during post approval use of other formulations of glycopyrrolate for other indications. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Additional adverse reactions identified during post approval use of glycopyrrolate tablets include: loss of taste and suppression of lactation.

Drugs Affected by Reduced GI Transit Time Glycopyrrolate reduces GI transit time, which may result in altered release of certain drugs when formulated in delayed- or controlled-release dosage forms. The passage of potassium chloride tablets through the GI tract may be arrested or delayed with coadministration of glycopyrrolate. Solid dosage forms of potassium chloride are contraindicated [see Contraindications ( 4 )] . Digoxin administered as slow dissolution oral tablets may have increased serum levels and enhanced action when administered with glycopyrrolate. Monitor patients receiving slow dissolution digoxin for increased action if glycopyrrolate is coadministered regularly. Consider the use of other oral dosage forms of digoxin (e.g., elixir or capsules). Amantadine The anticholinergic effects of glycopyrrolate may be increased with concomitant administration of amantadine. Consider decreasing the dose of glycopyrrolate during coadministration of amantadine. Drugs Whose Plasma Levels May be Increased by Glycopyrrolate Coadministration of glycopyrrolate may result in increased levels of certain drugs. Atenolol’s bioavailability may be increased with coadministration of glycopyrrolate. A reduction in the atenolol dose may be needed. Metformin plasma levels may be elevated with coadministration of glycopyrrolate, increasing metformin’s pharmacologic and toxic effects. Monitor clinical response to metformin with concomitant glycopyrrolate administration; consider a dose reduction of metformin if warranted. Drugs Whose Plasma Levels May be Decreased by Glycopyrrolate Coadministration of glycopyrrolate may result in decreased levels of certain drugs. Haloperidol’s serum level may be decreased when coadministered with glycopyrrolate, resulting in worsening of schizophrenic symptoms, and development of tardive dyskinesia. Closely monitor patients if coadministration cannot be avoided. Levodopa’s therapeutic effect may be reduced with glycopyrrolate administration. Consider increasing the dose of levodopa. Digoxin tablets: Use with glycopyrrolate can increase digoxin serum levels. Monitor patients and consider use of alternative dosage forms of digoxin. ( 7 ) Amantadine: Effects of glycopyrrolate may be increased with concomitant administration of amantadine. Consider decreasing the dose of glycoypyrrolate during concomitant use. ( 7 ) Atenolol or metformin: Glycopyrrolate may increase serum levels of atenolol or metformin. Consider dose reduction when used with glycopyrrolate. ( 7 ) Haloperidol or levodopa: Glycopyrrolate may decrease serum levels of haloperidol or levodopa. Consider a dose increase when used with glycopyrrolate. ( 7 )