Mirabegron is a beta-3 adrenergic agonist indicated for the treatment of overactive bladder (OAB) with symptoms of urge urinary incontinence, urgency, and urinary frequency Mirabegron, in combination with the muscarinic antagonist solifenacin succinate, is indicated for the treatment of OAB with symptoms of urge urinary incontinence, urgency, and urinary frequency
Beta-3 adrenergic agonist
Mirabegron is the first beta-3 adrenoceptor agonist. Mirabegron exerts its effect via a dual mechanism, both directly acts on the bladder smooth muscle and also via the sensory nervous system, it increases the levels of cyclic adenosine monophosphate (cyclic AMP) and leads to relaxation of the detrusor smooth muscle during storage phase of urinary bladder fill-void cycle by activation of beta-3 adrenoceptor which increase bladder capacity.
Recommended starting dose: 25 mg once daily, alone or in combination with solifenacin succinate 5 mg, once daily. Based on individual efficacy and tolerability, may increase dose to 50 mg once daily, alone or in combination with solifenacin succinate 5 mg, once daily. Swallow whole with water, with or without food, do not chew, divide or crush Patients with Severe Renal Impairment or Patients with Moderate Hepatic Impairment: Maximum dose is 25 mg Mirabegron once daily Patients with End Stage Renal Disease (ESRD) or Patients with Severe Hepatic Impairment: Not recommended
Effect of enzyme inhibitors: Mirabegron exposure (AUC) was increased 1.8-fold in the presence of the strong inhibitor of CYP3A/P-gp ketoconazole in healthy volunteers. No dose adjustment is needed when Mirabegron is combined with inhibitors of CYP3A and/or P-gp. However, in patients with mild to moderate renal impairment or mild hepatic impairment concomitantly receiving strong CYP3A inhibitors, such as itraconazole, ketoconazole, ritonavir and clarithromycin, the recommended dose is 25 mg once daily with or without food. Mirabegron is not recommended in patients with severe renal impairment or patients with moderate hepatic impairment concomitantly receiving strong CYP3A inhibitors.
Effect of enzyme inducers: Substances that are inducers of CYP3A or P-gp decrease the plasma concentrations of Mirabegron. No dose adjustment is needed for Mirabegron when administered with therapeutic doses of rifampicin or other CYP3A or P-gp inducers.
Effect of Mirabegron on CYP2D6 substrates: In healthy volunteers, the inhibitory potency of Mirabegron towards CYP2D6 is moderate and the CYP2D6 activity recovers within 15 days after discontinuation of Mirabegron. Multiple once daily dosing of Mirabegron IR resulted in a 90% increase in Cmax and a 229% increase in AUC of a single dose of metoprolol. Multiple once daily dosing of Mirabegron resulted in a 79% increase in Cmax and a 241% increase in AUC of a single dose of desipramine. Caution is advised if Mirabegron is co-administered with medicinal products with a narrow therapeutic index and significantly metabolised by CYP2D6, such as thioridazine, Type 1 C antiarrhythmics (e.g., flecainide, propafenone) and tricyclic antidepressants (e.g., imipramine, desipramine). Caution is also advised if Mirabegron is co-administered with CYP2D6 substrates that are individually dose titrated.
Effect of Mirabegron on transporters: Mirabegron is a weak inhibitor of P-gp. Mirabegron increased Cmax and AUC by 29% and 27%, respectively, of the P-gp substrate digoxin in healthy volunteers. For patients who are initiating a combination of Mirabegron and digoxin, the lowest dose for digoxin should be prescribed initially. Serum digoxin concentrations should be monitored and used for titration of the digoxin dose to obtain the desired clinical effect.
Other interactions: No clinically relevant interactions have been observed when Mirabegron was co-administered with therapeutic doses of solifenacin, tamsulosin, warfarin, metformin or a combined oral contraceptive medicinal product containing ethinylestradiol and levonorgestrel. Dose-adjustment is not recommended.
Mirabegron is contraindicated in patients with: Hypersensitivity to the active substance or to any of the excipients. Severe uncontrolled hypertension defined as systolic blood pressure ?180 mmHg and/or diastolic blood pressure ?110 mmHg.
The most common adverse reactions reported for patients treated with Mirabegron 50 mg during the three 12-week phase 3 double-blind, placebo-controlled studies are tachycardia and urinary tract infections. The frequency of tachycardia was 1.2% in patients receiving Mirabegron 50 mg. Tachycardia led to discontinuation in 0.1% patients receiving Mirabegron 50 mg. The frequency of urinary tract infections was 2.9% in patients receiving Mirabegron 50 mg. Urinary tract infections led to discontinuation in none of the patients receiving Mirabegron 50 mg. Serious adverse reactions included atrial fibrillation (0.2%).
Use in Pregnancy: There are limited amount of data from the use of Mirabegron in pregnant women. Studies in animals have shown reproductive toxicity. Mirabegron is not recommended during pregnancy and in women of childbearing potential not using contraception. Use in Lactation: Mirabegron is excreted in the milk of rodents and therefore, is predicted to be present in human milk. No studies have been conducted to assess the impact of mirabegron on milk production in humans, its presence in human breast milk, or its effects on the breast-fed child. Mirabegron should not be administered during breast-feeding
Mirabegron has been administered to healthy volunteers at single doses up to 400 mg. At this dose, adverse events reported included palpitations and increased pulse rate exceeding 100 beats per minute (bpm). 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 overdose should be symptomatic and supportive. In the event of overdose, pulse rate, blood pressure, and ECG monitoring is recommended.
Store in a cool and dry place, protected from light.
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