Mirabegron

Description

11 DESCRIPTION Mirabegron extended-release tablet for oral use is a beta-3 adrenergic agonist. The chemical name of mirabegron is 2-(2-Amino-1,3-thiazol-4-yl)-N-[4-(2-{([(2R)-2-hydroxy-2-phenylethyl] amino}ethyl)phenyl] acetamide having an empirical formula of C 21 H 24 N 4 O 2 S and a molecular weight of 396.51. The structural formula of mirabegron is: Mirabegron is an off-white to light yellow colored powder. It is practically insoluble in water. It is soluble in methanol and dimethyl sulfoxide. Each mirabegron extended-release tablet for oral use contains either 25 mg or 50 mg of mirabegron and the following inactive ingredients: butylated hydroxytoluene, D&C Yellow No.10 Aluminum Lake, FD&C Yellow No. 6, hydroxy propyl cellulose, hypromellose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, polyethylene oxide, titanium dioxide, triacetin.

What Is Mirabegron Used For?

1 INDICATIONS AND USAGE Mirabegron extended-release tablets are beta-3 adrenergic agonist indicated for the treatment of: Overactive bladder (OAB) in adult patients with symptoms of urge urinary incontinence, urgency, and urinary frequency. ( 1.1 ) 1.1 Adult Overactive Bladder (OAB) Mirabegron Extended-Release Tablets Monotherapy Mirabegron extended-release tablets are indicated for the treatment of OAB in adult patients with symptoms of urge urinary incontinence, urgency, and urinary frequency. Pediatric use information is approved for Astellas Pharma Global Development, Inc.'s MYRBETRIQ (mirabegron extended-release tablets). However, due to Astellas Pharma Global Development, Inc.'s marketing exclusivity rights, this drug product is not labeled with that information.

Dosage and Administration

2 DOSAGE AND ADMINISTRATION Mirabegron extended-release tablets and mirabegron for extended-release oral suspension are two different products and they are not substitutable on a milligram-per-milligram basis. Select the recommended product (mirabegron extended-release tablets or mirabegron for extended-release oral suspension) based on the indication. OAB in Adults The recommended starting dose of mirabegron extended-release tablets is 25 mg orally once daily. ( 2.2 ) After 4 to 8 weeks, the mirabegron extended-release tablets dose may be increased to 50 mg orally once daily. ( 2.2 ) Adult Patients with Renal or Hepatic Impairment: Refer to the full prescribing information for recommended dosage. ( 2.4 ) Administration Mirabegron Extended-Release Tablets: Adult patients: Swallow mirabegron extended-release tablets whole with water. Do not chew, divide, or crush. Take with or without food. ( 2.7 ) 2.1 Important Dosage Information Mirabegron extended-release tablets and mirabegron for extended-release oral suspension are two different products and they are not substitutable on a milligram-per milligram basis: Select the recommended product (mirabegron extended-release tablets or mirabegron for extended-release oral suspension) based on the indication [see Indications and Usage ( 1 )] . 2.2 Recommended Dosage for Adult Patients with OAB Mirabegron Extended-Release Tablets Monotherapy The recommended starting dosage of mirabegron extended-release tablets is 25 mg orally once daily. If needed, increase to the maximum dosage of mirabegron extended-release tablets 50 mg orally once daily after 4 to 8 weeks. For administration instructions, see Dosage and Administration ( 2.7 ) . Pediatric use information is approved for Astellas Pharma Global Development, Inc.'s MYRBETRIQ (mirabegron extended-release tablets). However, due to Astellas Pharma Global Development, Inc.'s marketing exclusivity rights, this drug product is not labeled with that information 2.4 Recommended Dosage in Adult Patients with Renal or Hepatic Impairment Dosage in Adults with Renal Impairment The recommended dosage of mirabegron extended-release tablets (administered orally once daily) in adult patients with renal impairment is described in Table 2 [see Use in Specific Populations 8.6 )]. For administration instructions, see Dosage and Administration ( 2.7 ). Table 2: Mirabegron Extended-Release Tablets Recommended Dosage in Adult Patients with Renal Impairment (Administered Orally Once Daily) Estimated GFR Estimated GFR using the modification of diet in renal disease (MDRD) formula. Starting Dose Maximum Dose eGFR 30 to 89 mL/min/1.73 m 2 25 mg 50 mg eGFR 15 to 29 mL/min/1.73 m 2 25 mg 25 mg eGFR < 15 mL/min/1.73 m 2 or requiring dialysis Not recommended Dosage in Adults with Hepatic Impairment The recommended dosage of mirabegron extended-release tablets (administered orally once daily) in adult patients with hepatic impairment is described in Table 3 [see Use in Specific...

Side Effects (Adverse Reactions)

6 ADVERSE REACTIONS Most commonly reported adverse reactions with mirabegron monotherapy in adult patients with OAB (> 2% and > placebo) were hypertension, nasopharyngitis, urinary tract infection, and headache. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Lupin Pharmaceuticals, Inc. at 1-800-399-2561 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. The following adverse reactions are discussed in more detail in other sections of the labeling. Hypertension [see Warnings and Precautions ( 5.1 )] Urinary Retention [see Warnings and Precautions ( 5.2 )] Angioedema [see Warnings and Precautions ( 5.3 )] 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 clinical practice. Mirabegron Extended-Release Tablets Monotherapy for Adult OAB In three, 12-week, double-blind, placebo-controlled, safety and efficacy studies in patients with OAB (Studies 1, 2, and 3), mirabegron extended-release tablets were evaluated for safety in 2736 patients [see Clinical Studies ( 14.1 )] . Study 1 also included an active control. For the combined Studies 1, 2, and 3, 432 patients received mirabegron extended-release tablets 25 mg, 1375 received mirabegron extended-release tablets 50 mg, and 929 received mirabegron extended-release tablets 100 mg once daily. In these studies, the majority of the patients were Caucasian (94%) and female (72%) with a mean age of 59 years (range 18 to 95 years). Mirabegron extended-release tablets were also evaluated for safety in 1632 patients who received mirabegron extended-release tablets 50 mg once daily (n=812 patients) or mirabegron extended-release tablets 100 mg (n=820 patients) in a 1-year, randomized, fixed-dose, double-blind, active-controlled, safety study in patients with OAB (Study 4). Of these patients, 731 received mirabegron extended-release tablets in a previous 12-week study. In Study 4, 1385 patients received mirabegron extended-release tablets continuously for at least 6 months, 1311 patients received mirabegron extended-release tablets for at least 9 months, and 564 patients received mirabegron extended-release tablets for at least 1 year. The most frequent adverse events (0.2%) leading to discontinuation in Studies 1, 2, and 3 for the 25 mg or 50 mg dose were nausea, headache, hypertension, diarrhea, constipation, dizziness, and tachycardia. Atrial fibrillation (0.2%) and prostate cancer (0.1%) were reported as serious adverse events by more than 1 patient and at a rate greater than placebo. Table 8 lists the adverse reactions, derived from all adverse events, that were reported in Studies 1, 2, and 3 at an incidence greater than placebo and in 1% or more of patients treated with mirabegron extended-release tablets 25 mg or 50 mg once daily for up to 12 weeks. The most commonly reported adverse reactions (greater than 2% of mirabegron extended-release tablets patients and greater than placebo) were hypertension, nasopharyngitis, urinary tract infection, and headache. Table 8: Percentages of Patients with Adverse Reactions, Derived from All Adverse Events, Exceeding Placebo Rate and Reported in ≥ 1% of OAB Patients Treated with Mirabegron Extended-Release Tablets, 25 mg or 50 mg Once Daily in Studies 1, 2, and 3 Adverse Reaction Placebo (%) Mirabegron Extended- Release Tablets 25 mg (%) Mirabegron Extended- Release Tablets 50 mg (%) Number of Patients 1380 432 1375 Hypertension Includes reports of blood pressure above the normal range, and BP increased from baseline, occurring predominantly in subjects with baseline hypertension. 7.6 11.3 7.5 Nasopharyngitis 2.5 3.5 3.9 Urinary Tract Infection 1.8 4.2 2.9 Headache 3.0 2.1 3.2 Constipation 1.4 1.6 1.6 Upper Respiratory Tract Infection 1.7 2.1 1.5 Arthralgia 1.1 1.6 1.3 Diarrhea 1.3 1.2 1.5 Tachycardia 0.6 1.6...

Drug Interactions

7 DRUG INTERACTIONS Drugs Metabolized by CYP2D6 : Mirabegron is a CYP2D6 inhibitor and, when used concomitantly with drugs metabolized by CYP2D6, especially narrow therapeutic index drugs, appropriate monitoring and possible dose adjustment of those drugs may be necessary. ( 5.4 , 7.1 , 12.3 ) Digoxin : When initiating a combination of mirabegron and digoxin, use the lowest dose of digoxin; monitor serum digoxin concentrations to titrate digoxin dose to desired clinical effect. ( 7.2 , 12.3 ) Pediatric use information is approved for Astellas Pharma Global Development, Inc.'s MYRBETRIQ (mirabegron extended-release tablets). However, due to Astellas Pharma Global Development, Inc.'s marketing exclusivity rights, this drug product is not labeled with that information. Drug interaction studies were conducted in adult patients to investigate the effect of coadministered drugs on the pharmacokinetics of mirabegron and the effect of mirabegron on the pharmacokinetics of coadministered drugs (e.g., ketoconazole, rifampin, solifenacin succinate, tamsulosin, and oral contraceptives) [see Clinical Pharmacology ( 12.3 )] . No dose adjustment is recommended when these drugs are coadministered with mirabegron. The following are drug interactions for which monitoring is recommended: 7.1 Drugs Metabolized by CYP2D6 Since mirabegron is a moderate CYP2D6 inhibitor, the systemic exposure of drugs metabolized by CYP2D6 enzyme is increased when coadministered with mirabegron. Therefore, appropriate monitoring and dose adjustment may be necessary when mirabegron extended-release tablet is coadministered with these drugs, especially with narrow therapeutic index CYP2D6 substrates [see Warnings and Precautions ( 5.4 ) and Clinical Pharmacology ( 12.3 )] . 7.2 Digoxin When given in combination, 100 mg mirabegron increased mean digoxin C max from 1.01 to 1.3 ng/mL (29%) and AUC from 16.7 to 19.3 ng.h/mL (27%). For patients who are initiating a combination of mirabegron and digoxin, the lowest dose for digoxin should initially be considered. Serum digoxin concentrations should be monitored and used for titration of the digoxin dose to obtain the desired clinical effect [see Clinical Pharmacology ( 12.3 )]. 7.3 Warfarin The mean C max of S - and R -warfarin was increased by approximately 4% and AUC by approximately 9% when administered as a single dose of 25 mg after multiple doses of 100 mg mirabegron. Following a single dose administration of 25 mg warfarin, mirabegron had no effect on the warfarin pharmacodynamic endpoints such as International Normalized Ratio (INR) and prothrombin time. However, the effect of mirabegron on multiple doses of warfarin and on warfarin pharmacodynamic end points such as INR and prothrombin time has not been fully investigated [see Clinical Pharmacology ( 12.3 )] .

Contraindications

4 CONTRAINDICATIONS Hypersensitivity to mirabegron or any inactive ingredients. ( 4 ) Mirabegron extended-release tablets are contraindicated in patients with known hypersensitivity reactions to mirabegron or any inactive ingredients of the tablet [see Adverse Reactions ( 6.1 , 6.2 )] .

Pregnancy and Breastfeeding

8.1 Pregnancy Risk Summary There are no studies with the use of mirabegron in pregnant women or adolescents to inform a drug-associated risk of major birth defects, miscarriages, or adverse maternal or fetal outcomes. Mirabegron administration to pregnant animals during organogenesis resulted in reversible skeletal variations (in rats) at 22-fold (via AUC) the maximum recommended human dose (MRHD) of 50 mg/day and decreased fetal body weights (in rabbits) at 14-fold the MRHD. At maternally-toxic exposures in rats (96-fold), decreased fetal weight and increased fetal mortality were observed and, in rabbits (36-fold), cardiac findings (fetal cardiomegaly and fetal dilated aortae) were observed [see Data] . The estimated background risks of major birth defects and miscarriage for the indicated populations are unknown. In the U.S. general population, the estimated background risk of major birth defects or miscarriage in clinically recognized pregnancies are 2 to 4% and 15 to 20%, respectively. Data Animal Data: No embryo-fetal lethality or morphological fetal developmental abnormalities were produced in pregnant rats following daily oral administration of mirabegron during the period of organogenesis (Days 7 to 17 of gestation) at 0, 10, 30, 100, or 300 mg/kg, doses which were associated with systemic exposures (AUC) 0, 1, 6, 22, and 96-fold the MRHD. Skeletal variations (wavy ribs, delayed ossification) were observed in fetuses at doses 22-fold the systemic exposure at the MRHD and were reversible during development. Exposures 96-fold the MRHD were maternally-toxic (mortality, decreased body weight gain) and associated with fetal growth reduction. Pregnant rabbits were treated with daily oral doses of mirabegron at 0, 3, 10, or 30 mg/kg/day during the period of organogenesis (Days 6 to 20 of gestation), which resulted in plasma exposures that were 0, 1, 14, or 36-fold the MRHD based on AUC. At 10 mg/kg/day (14-fold the MRHD) and higher, fetal body weights were...

8.2 Lactation Risk Summary There are no data on the presence of mirabegron in human milk, the effects on the breastfed child, or the effects on milk production. Mirabegron-related material was present in rat milk and in the stomach of nursing pups following administrations of a single 10 mg/kg oral dose of 14 C-labeled mirabegron to lactating rats. When a drug is present in animal milk, it is likely that the drug will be present in human milk. The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for mirabegron extended-release tablets and any potential adverse effects on the breastfed child from mirabegron or from the underlying maternal condition.

Overdosage

10 OVERDOSAGE Mirabegron has been administered to healthy volunteers at single doses up to 400 mg. At this dose, adverse events reported included palpitations (1 of 6 subjects) and increased pulse rate exceeding 100 beats per minute (bpm) (3 of 6 subjects). Multiple doses of mirabegron up to 300 mg daily for 10 days showed increases in pulse rate and systolic blood pressure when administered to healthy volunteers. Treatment for overdosage should be symptomatic and supportive. In the event of overdosage, pulse rate, blood pressure and ECG monitoring is recommended.

How Supplied

16 HOW SUPPLIED/STORAGE AND HANDLING 16.1 Mirabegron Extended-Release Tablets Mirabegron extended-release tablets are supplied as oval, film-coated, extended-release tablets, available in bottles as follows: Strength 50 mg Color Pale-yellow Debossed M50, LU Bottle of 30 NDC 71335-2808-1 Store and Dispense Store at 25°C (77°F) with excursions permitted from 15° to 30°C (59° to 86°F). [see USP Controlled Room Temperature]. Repackaged/Relabeled by: Bryant Ranch Prepack, Inc. Burbank, CA 91504