Miglustat

1 INDICATIONS AND USAGE YARGESA is a glucosylceramide synthase inhibitor indicated as monotherapy for treatment of adult patients with mild/moderate type 1 Gaucher disease for whom enzyme replacement therapy is not a therapeutic option ( 1.1 ). 1.1 Type 1 Gaucher Disease YARGESA is indicated as monotherapy for the treatment of adult patients with mild to moderate type 1 Gaucher disease for whom enzyme replacement therapy is not a therapeutic option (e.g. due to allergy, hypersensitivity, or poor venous access).

2 DOSAGE AND ADMINISTRATION • Recommended dosage is 100 mg administered orally three times a day at regular intervals ( 2.1 ). • May reduce dosage to 100 mg once or twice a day in some patients due to tremor or diarrhea ( 2.1 ). • Adjust in patients with renal impairment ( 2.2 ): Renal Impairment Adjusted Creatinine Clearance (in mL/min/1.73 m 2 ) Recommendations Mild 50 – 70 Start dose at 100 mg twice a day Moderate 30 – 50 Start dose at 100 mg once a day Severe < 30 Use is not recommended 2.1 Instructions for Administration Therapy should be directed by physicians who are knowledgeable in the management of Gaucher disease. The recommended dose for the treatment of adult patients with type 1 Gaucher disease is one 100 mg capsule administered orally three times a day at regular intervals. If a dose is missed, the next YARGESA capsule should be taken at the next scheduled time. It may be necessary to reduce the dose to one 100 mg capsule once or twice a day in some patients due to adverse reactions, such as tremor or diarrhea. 2.2 Patients with Renal Insufficiency In patients with mild renal impairment (adjusted creatinine clearance 50-70 mL/min/1.73 m 2 ), initiate YARGESA treatment at a dose of 100 mg twice per day. In patients with moderate renal impairment (adjusted creatinine clearance of 30-50 mL/min/1.73 m 2 ), initiate YARGESA treatment at a dose of one 100 mg capsule per day. YARGESA is not recommended for use in patients with severe renal impairment (creatinine clearance <30 mL/min/1.73 m 2 ) [ see Use in Specific Populations (8.6) ].

6 ADVERSE REACTIONS The following serious adverse reactions are described below and elsewhere in the labeling: • Peripheral Neuropathy [ see Warnings and Precautions (5.1) ] • Tremor [ see Warnings and Precautions (5.2) ] • Diarrhea and weight loss [ see Warnings and Precautions (5.3) ] • Reductions in platelet count [ see Warnings and Precautions (5.4) ] The most common adverse reactions (incidence ≥ to 5%) are: diarrhea, weight loss, stomach pain, gas, nausea and vomiting, headache including migraine, tremor, leg cramps, dizziness, weakness, vision problems, thrombocytopenia, muscle cramps, back pain, constipation, dry mouth, heaviness in arms and legs, memory loss, unsteady walking, anorexia, indigestion, paresthesia, stomach bloating, stomach pain not related to food, and menstrual changes ( 6.1 ). To report SUSPECTED ADVERSE REACTIONS, contact Edenbridge Pharmaceuticals, LLC at 1-877-381-3336 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 of 80 patients with type 1 Gaucher disease in two open-label, uncontrolled, monotherapy trials, one open-label, active-controlled trial, and two extensions, who received miglustat capsules at doses ranging from 50 mg to 200 mg three times daily. Patients were aged 18 to 69 years at first treatment. The population was evenly distributed by gender. The most common serious adverse reaction reported with miglustat capsules treatment in clinical trials was peripheral neuropathy [ see Warnings and Precautions (5.1) ]. The most commonly reported adverse reactions in patients treated with miglustat capsules (occurring in ≥ to 5%) that were considered related to miglustat capsules are shown in Tables 1 and 2. [ see Warnings and Precautions (5.2 , 5.3) ]. The most common adverse reactions requiring intervention were diarrhea and tremor. [ see Warnings and Precautions (5.2 , 5.3) ]. In two open-label, uncontrolled monotherapy trials, adult type 1 Gaucher disease patients were treated with miglustat capsules at a starting dose of 100 mg three times daily (dose range 100 to 200 mg three times daily) for up to 12 months in 28 patients [Study 1], or at a dose of 50 mg three times daily for up to 6 months in 18 patients [Study 2]. Table 1 below lists adverse reactions that occurred during the trials in ≥ to 5% of patients. Table 1: Adverse Reactions in greater than or equal to 5% of Patients in Two Open-Label, Uncontrolled Monotherapy Trials of miglustat capsules Incidence of adverse reactions Study 1 (starting dose 100mg three times daily) Study 2 (50mg three times daily) Patients entered in Study (n) 28 18 Body System – Preferred Term % of patients reporting % of patients reporting Gastrointestinal System Diarrhea 89 89 Flatulence 29 44 Abdominal Pain 18 50 Nausea 14 22 Vomiting 4 11 Bloating 0 6 Anorexia 7 0 Dyspepsia 7 0 Epigastric pain not food-related 0 6 Metabolic and Nutritional Disorders Weight Decrease 39 67 Central and Peripheral Nervous System Headache 21 22 Tremor 11 11 Dizziness 0 11 Leg cramps 4 11 Paresthesia 7 0 Migraine 0 6 Vision Disorders Visual Disturbance 0 17 Musculoskeletal Disorders Cramps 0 11 Platelet, Bleeding and Clotting Disorders Thrombocytopenia 7 6 Reproductive disorders, female Menstrual disorder 0 6 In an open-label, active-controlled study, 36 adult type 1 Gaucher disease patients were treated with miglustat capsules, imiglucerase, or miglustat capsules plus imiglucerase [Study 3] for up to 12 months. Table 2 lists adverse reactions that occurred during the trial in greater than or equal to 5% of patients. Table 2: Adverse Reactions in greater than or equal to 5% of Patients in Open-Label Active Controlled Study Incidence of adverse reactions Miglustat capsules alone Imiglucerase alone Patients entered in Study (n) 12 12 Body System – Preferred Term % of patients reporting % of patients reporting Gastrointestinal System Diarrhea 100 0 Abdominal Pain 67 0 Flatulence 50 0 Constipation 8 0 Nausea 8 0 Dry Mouth 8 0 Body as Whole Pain 0 8 Generalized weakness 17 0 Abdominal distension 8 0 Back pain 8 0 Heaviness in limbs 8 0 Metabolic and Nutritional Disorders Weight Decrease 67 0 Central Peripheral Nervous System Tremor 17 0 Dizziness 8 0 Leg cramps 8 0 Unsteady gait 8 0 Psychiatric disorders Memory loss 8 0

12.3 Pharmacokinetics Absorption: After a 100 mg oral dose, the time to maximum observed plasma concentration of miglustat (t max ) ranged from 2 to 2.5 hours in Gaucher patients. Plasma concentrations show a biexponential decline, characterized by a short distribution phase and a longer elimination phase. The effective half-life of miglustat is approximately 6 to 7 hours, which predicts that steady-state will be achieved by 1.5 to 2 days following the start of three times daily dosing. Miglustat, dosed at 50 and 100 mg three times daily in Gaucher patients, exhibits dose-proportional pharmacokinetics. The pharmacokinetics of miglustat were not altered after repeated dosing three times daily for up to 12 months. In healthy subjects, co-administration of miglustat capsules with food results in a decrease in the rate of absorption of miglustat (maximum plasma concentration [C max ] was decreased by 36% and t max delayed 2 h) but had no statistically significant effect on the extent of absorption of miglustat (area-under-the-plasma-concentration time curve [AUC] was decreased by 14%). The mean oral bioavailability of a 100-mg miglustat capsule is about 97% relative to an oral solution administered under fasting conditions. The pharmacokinetics of miglustat were similar between adult type 1 Gaucher disease patients and healthy subjects after a single dose administration of miglustat 100 mg. Distribution: Miglustat does not bind to plasma proteins. Mean apparent volume of distribution of miglustat is 83-105 liters in Gaucher patients. At steady state, the concentration of miglustat in cerebrospinal fluid of six non-Gaucher patients was 31.4-67.2% of that in plasma, indicating that miglustat crosses the blood brain barrier. Metabolism and Excretion: The major route of excretion of miglustat is via kidney. Following administration of a single dose of 100 mg 14 C-miglustat to healthy volunteers, 83% of the radioactivity was recovered in urine and 12% in feces. In healthy subjects, 67% of the administered dose was excreted unchanged in urine over 72 hours. The most abundant metabolite in urine was miglustat glucuronide accounting for 5% of the dose. The terminal half-life of radioactivity in plasma was 150 hours, suggesting the presence of one or more metabolites with a prolonged half-life. The metabolite accounting for this observation has not been identified but may accumulate and reach concentrations exceeding those of miglustat at steady state. Specific Populations Gender : There was no statistically significant gender difference in miglustat pharmacokinetics, based on pooled data analysis. Race : Ethnic differences in miglustat pharmacokinetics have not been evaluated in Gaucher patients. However, apparent oral clearance of miglustat in patients of Ashkenazi Jewish descent was not statistically different to that in others (1 Asian and 15 Caucasians), based on a cross-study analysis. Hepatic Impairment: No studies have been performed to assess the pharmacokinetics of miglustat in patients with hepatic impairment. Renal Impairment: Limited data in non-Gaucher patients with impaired renal function indicate that the apparent oral clearance (CL/F) of miglustat decreases with decreasing renal function. While the number of subjects with mild and moderate renal impairment was very small, the data suggest an approximate decrease in the apparent oral clearance of 40% and 60% respectively, in mild and moderate renal impairment, justifying the need to decrease the dosing of miglustat in such patients dependent upon creatinine clearance levels [ see Dosage and Administration (2.2) ]. Data in severe renal impairment are limited to two patients with creatinine clearances in the range 18-29 mL/min and cannot be extrapolated below this range. These data suggest a decrease in CL/F by at least 70% in patients with severe renal impairment [ see Dosage and Administration (2.2) and Use in Specific Populations (8.6) ]. Drug Interaction Studies Miglustat does not inhibit the metabolism of various substrates of cytochrome P450 enzymes including, CYP1A2, CYP2A6, CYP2C9, CYP2C19, CYP2D6, CYP2E1, CYP3A4 and CYP4A11 in vitro; consequently significant interactions via inhibition of these enzymes are unlikely with drugs that are substrates of cytochrome P450 enzymes. Drug interaction between miglustat capsules (miglustat 100 mg orally three times daily) and imiglucerase 7.5 or 15 U/kg/day was assessed in imiglucerase-stabilized patients after one month of co-administration. There was no significant effect of imiglucerase on the pharmacokinetics of miglustat, with the co-administration of imiglucerase and miglustat resulting in a 22% reduction in Cmax and a 14% reduction in the AUC for miglustat. While miglustat capsules appeared to increase the clearance of imiglucerase by 70%, these results are not conclusive because of the small number of subjects studied and because patients took variable doses of imiglucerase [see Drug Interactions (7) ]. Concomitant therapy with loperamide during clinical trials did not appear to significantly alter the pharmacokinetics of miglustat.