Betmiga

Active Substance: mirabegron
Common Name: mirabegron
ATC Code: G04BD12
Marketing Authorisation Holder: Astellas Pharma Europe B.V.
Active Substance: mirabegron
Status: Authorised
Authorisation Date: 2012-12-20
Therapeutic Area: Urinary Bladder, Overactive
Pharmacotherapeutic Group: Urologicals

Therapeutic Indication

Symptomatic treatment of urgency.

Increased micturition frequency and / or urgency incontinence as may occur in adult patients with overactive-bladder syndrome.

What is Betmiga?

Betmiga is a medicine containing the active substance mirabegron. It is available as prolonged-release tablets (25 mg, 50 mg). ‘Prolonged-release’ means that mirabegron is released slowly from the tablet over a few hours.

What is Betmiga used for?

Betmiga is used in adults with overactive bladder syndrome. It is used to treat certain symptoms of the condition: urgency (sudden urge to urinate), increased urinary frequency (the need to urinate frequently) and urge incontinence (involuntary leakage of urine from the bladder when a sudden strong need to urinate is felt).

The medicine can only be obtained with a prescription.

How is Betmiga used?

The recommended dose of Betmiga is 50 mg once a day. In patients who have reduced kidney or liver function the doctor may need to prescribe a lower dose or avoid the use of Betmiga, especially in patients taking certain other medicines.

For full details, see the package leaflet (also part of the EPAR).

How does Betmiga work?

The active substance in Betmiga, mirabegron, is a beta-3-adrenergic-receptor agonist. It works by attaching to and activating beta-3 receptors that are found in the muscle cells of the bladder. 

Experimental studies have shown that, when activated, beta-3 receptors cause the bladder muscles to relax. This is thought to lead to an increase in the capacity of the bladder and changes in the way the bladder contracts, resulting in fewer bladder contractions and thus fewer unwanted urinations.

How has Betmiga been studied?

The effects of Betmiga were first tested in experimental models before being studied in humans.

Betmiga has been studied in three main studies involving 4,611 patients with overactive bladder syndrome. Patients received Betmiga (25 mg, 50 mg or 100 mg) or placebo (a dummy treatment) every day for three months. The main measure of effectiveness was the change in the number of urinations and incontinence episodes per day after three months of treatment.

What benefit has Betmiga shown during the studies?

Treatment with 50 mg a day of Betmiga was shown to be effective in reducing the number of urination and incontinence episodes. After three months of treatment, on average Betmiga 50 mg reduced the number of urinations by 1.8 per day compared with a reduction of 1.2 per day for placebo. Betmiga 50 mg resulted in a reduction of 1.5 incontinence episodes per day compared with a reduction of 1.1 incontinence episodes per day for placebo.

What is the risk associated with Betmiga?

The most common side effects with Betmiga are tachycardia (rapid heartbeat) seen in just over 1 person in 100, and urinary tract infection (infection of the structures that carry urine) seen in just under 3 people in 100. Serious but uncommon side effects include atrial fibrillation (cardiac rhythm disorder). For the full list of all side effects reported with Betmiga, see the package leaflet.

Betmiga must not be used in people who are hypersensitive (allergic) to mirabegron or any of the other ingredients.

Why has Betmiga been approved?

The CHMP noted that the beneficial effects seen with Betmiga were modest but comparable to the benefits of other medicines authorised for this condition. 

Regarding its safety, most side effects are comparable to those of other medicines used for treating overactive bladder syndrome. The potential risk of hypersensitivity (allergic reactions) and effects on the heart has been adequately addressed in the product information. The CHMP therefore decided that Betmiga’s benefits are greater than its risks and recommended that it be given marketing authorisation.

Other information about Betmiga

The European Commission granted a marketing authorisation valid throughout the European Union for Betmiga on 20 December 2012.

Source: European Medicines Agency

Disclaimer: Every effort has been made to ensure that the information provided here is accurate, up-to-date and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. This information has been compiled for use by healthcare practitioners and consumers in the United States. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate that the drug or combination is safe, effective or appropriate for any given patient. If you have questions about the substances you are taking, check with your doctor, nurse or pharmacist.

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