Glycopyrrolate Oral Solution

1 INDICATIONS AND USAGE 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)

2 DOSAGE AND ADMINISTRATION 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 5-7 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

6 ADVERSE REACTIONS 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 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 Post Marketing Experience The following adverse reactions have been identified during postapproval 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 postapproval use of glycopyrrolate tablets include: loss of taste and suppression of lactation.

12.3 Pharmacokinetics Absorption In a parallel study of children (n=6 per group) aged 7-14 years undergoing intraocular surgery, subjects received either intravenous (IV) or oral glycopyrrolate as a premedication. The mean absolute bioavailability of oral glycopyrrolate tablets was low (approximately 3%) and highly variable among subjects (range 1.3 to 13.3%). A similar pattern of low and variable relative bioavailability is seen in adults. Analysis of population pharmacokinetic data from normal adults and children with cerebral palsy associated chronic moderate to severe drooling failed to demonstrate linear pharmacokinetics across the dose range. In the same analysis, population estimates of the apparent oral clearance (scaled by weight in children and adults) ranged from 5.28 - 38.95 L/hr/kg for healthy adults and 8.07 - 25.65 L/hr/kg for patients with cerebral palsy, a reflection of the low and highly variable oral bioavailability of glycopyrrolate. Absorption of glycopyrrolate oral solution (fasting) was compared to that of a marketed glycopyrrolate oral tablet. The Cmax after oral solution administration was 23% lower compared to tablet administration and AUC0-inf was 28% lower after oral solution administration. Mean Cmax after oral solution administration in the fasting state was 0.318 ng/mL, and mean AUC 0-24 was 1.74 ng.hr/mL. Mean time to maximum plasma concentration for glycopyrrolate oral solution was 3.1 hours, and mean plasma half-life was 3.0 hours. In healthy adults, a high fat meal was shown to significantly affect the absorption of glycopyrrolate oral solution (10 mL, 1 mg/5 mL). The mean Cmax under fed high fat meal conditions was approximately 74% lower than the Cmax observed under fasting conditions. Similarly, mean AUC 0-T was reduced by about 78% by the high fat meal compared with the fasting AUC 0-T . A high fat meal markedly reduces the oral bioavailability of glycopyrrolate oral solution. Therefore, glycopyrrolate oral solution should be dosed at least one hour before or two hours after meals. Pharmacokinetic results (mean ± SD) are described in Table 3. Table 3: Pharmacokinetic Parameters (mean±SD) for Glycopyrrolate Oral Solution, Fasting and Fed, in Healthy Adults C max (ng/mL) T max (hrs) AUC 0-T (ng·hr/mL) AUC 0-Inf (ng·hr/mL) T 1/2 (hrs) Fasting (n=37) 0.318 ± 0.190 3.10 ± 1.08 1.74 ± 1.07 1.81 ± 1.09 3.0 ± 1.2 Fed (n=36) 0.084 ± 0.081 2.60 ± 1.12 0.38 ± 0.14 0.46 ± 0.13* 3.2 ± 1.1* * n=35 Distribution After IV administration, glycopyrrolate has a mean volume of distribution in children aged 1 to 14 years of approximately 1.3 to 1.8 L/kg, with a range from 0.7 to 3.9 L/kg. In adults aged 60-75 years, the volume of distribution was lower (0.42 L/kg +/- 0.22). Metabolism In adult patients who underwent surgery for cholelithiasis and were given a single IV dose of tritiated glycopyrrolate, approximately 85% of total radioactivity was excreted in urine and <5% was present in T-tube drainage of bile. In both urine and bile, >80% of the radioactivity corresponded to unchanged drug. These data suggest a small proportion of IV glycopyrrolate is excreted as one or more metabolites. Elimination Approximately 65-80% of an IV glycopyrrolate dose was eliminated unchanged in urine in adults. In two studies, after IV administration to pediatric patients ages 1-14 years, mean clearance values ranged from 1.01- 1.41 L/kg/hr (range 0.32 -2.22 L/kg/hr). In adults, IV clearance values were 0.54 ± 0.14 L/kg/hr. Pediatrics The estimated apparent clearance of glycopyrrolate from a population pharmacokinetic analysis (scaled by weight in children and adults) of oral and IV data was found to be 13.2 L/hr/kg or 92.7 L/hr for a typical 70 kg subject. In the same population based analysis, gender was not identified as having an effect on either glycopyrrolate clearance or systemic exposure. Gender Population pharmacokinetic evaluation of adults and children administered IV or oral glycopyrrolate identified no effect of gender on glycopyrrolate clearance or systemic exposure. Race The pharmacokinetics of glycopyrrolate by race has not been characterized. Elderly Glycopyrrolate pharmacokinetics have not been characterized in the elderly. Renal Impairment In one study, glycopyrrolate 4 mcg/kg was administered intravenously in uremic patients undergoing renal transplantation surgery. Mean AUC (10.6 mcg·h/L), mean plasma clearance (0.43 L/hr/kg) and mean 3-hour urinary excretion (0.7%) for glycopyrrolate were significantly different than those of control patients (3.73 µg·h/L, 1.14 L/hr/kg, and 50%, respectively). These results suggest that elimination of glycopyrrolate is severely impaired in patients with renal failure. Hepatic Impairment Glycopyrrolate is largely renally eliminated. The pharmacokinetics of glycopyrrolate have not been evaluated in patients with hepatic impairment