What Is Mirabegron XR? Uses, Dosage, and What You Need to Know in 2026

Mirabegron XR is a prescription medication used to treat overactive bladder — one of the most common bladder conditions in the United States. Unlike most OAB drugs that have been around for decades, Mirabegron XR represents a newer class of treatment with a different mechanism and a cleaner side effect profile. Here is everything patients need to know about this medication in 2026.

What Is Mirabegron XR?

Mirabegron XR is the generic name for the extended-release form of mirabegron, an oral medication sold under the brand name Myrbetriq by Astellas Pharma. It belongs to a class of drugs called beta-3 adrenergic agonists — a class that was first introduced to U.S. patients with mirabegron's FDA approval in June 2012.

The "XR" or "ER" designation stands for extended-release, meaning the medication is slowly released from the tablet throughout the day. This allows for once-daily dosing. Mirabegron XR tablets should be swallowed whole — do not crush, chew, or break them, as this will disrupt the extended-release mechanism and release the full dose at once.

What Conditions Does Mirabegron XR Treat?

Mirabegron XR is FDA-approved to treat:

Overactive bladder (OAB) in adults: Including symptoms of urge urinary incontinence (leaking urine due to sudden urge), urgency (sudden strong urge to urinate), and urinary frequency (urinating 8+ times per 24 hours). It can be used alone or in combination with solifenacin (Vesicare).

Neurogenic detrusor overactivity (NDO) in pediatric patients: For children aged 3 years and older weighing at least 35 kg. Causes of NDO in children include spina bifida, spinal cord injury, and multiple sclerosis. Myrbetriq Granules (oral suspension) is available for younger children.

What Is Overactive Bladder (OAB)?

Overactive bladder is a condition in which the bladder muscle (detrusor) contracts involuntarily, creating a sudden, strong urge to urinate. OAB affects roughly 33 million Americans and is more common in older adults. Symptoms include:

Urgency: A sudden, strong urge to urinate that is difficult to defer

Frequency: Urinating 8 or more times in 24 hours

Nocturia: Waking up 2 or more times at night to urinate

Urge incontinence: Leaking urine before reaching the bathroom

How Is Mirabegron XR Dosed?

For adults with OAB:

Starting dose: 25 mg once daily (with or without food)

Dose increase: After 4-8 weeks, your doctor may increase to 50 mg once daily if needed for better symptom control

Maximum dose: 50 mg once daily for most patients

Severe kidney disease (eGFR 15-29): Maximum 25 mg/day; not recommended for dialysis patients

Moderate liver disease (Child-Pugh B): Maximum 25 mg/day; not recommended for severe liver disease

38,912+ patients found their medications in stock

38K+

Find Mirabegron XR In Stock Today →

How to Take Mirabegron XR Correctly

Take once daily at approximately the same time each day

Swallow the tablet whole with water — do not crush, chew, or break it

Can be taken with or without food (adults)

If you miss a dose and less than 12 hours have passed, take it as soon as you remember

If more than 12 hours have passed since the missed dose, skip it and take your next regular dose

Store at room temperature (68-77°F); keep away from excess heat and moisture

When Does Mirabegron XR Start Working?

Mirabegron XR takes time to reach its full effect. Most patients notice some improvement within the first few weeks, but the full benefit may take 8 weeks or longer. Don't give up if you don't see dramatic results immediately — continue taking it as prescribed and follow up with your doctor.

Skip the calls, skip the stress.

Find Mirabegron XR In Stock Today →

50K+

Medications
Found

99%

Success
Rate

6+

Hours saved
on average

Who Should NOT Take Mirabegron XR?

Patients with known allergy to mirabegron or any tablet ingredients

Patients with severe uncontrolled hypertension (SBP ≥180 mmHg or DBP ≥110 mmHg)

Patients with end-stage renal disease or severe liver impairment

For a full review of what to watch for once you start treatment, see our guide on Mirabegron XR side effects.