Generic Myrbetriq
Has Arrived
What is Generic Mirabegron?
Mirabegron is the active ingredient in the brand-name medication Myrbetriq, manufactured by Astellas Pharma. Apotex Inc., one of Canada's largest pharmaceutical companies, has now launched a Health Canada–approved generic version — making this effective overactive bladder (OAB) therapy more accessible and affordable.
Mirabegron belongs to the drug class known as beta-3 adrenergic agonists. It works differently from traditional anticholinergic OAB medications — relaxing the detrusor muscle of the bladder during the filling phase, increasing bladder capacity, and reducing the urgency and frequency of urination without the anticholinergic side effects commonly associated with older therapies.
Same active ingredient. Same mechanism. Same results. The generic contains the same amount of mirabegron as brand-name Myrbetriq and is bioequivalent — meaning it works the same way in the body at a lower cost to patients.
How Does Mirabegron Work?
The bladder wall contains beta-3 adrenergic receptors. Mirabegron selectively activates these receptors, causing relaxation of the smooth muscle (detrusor) in the bladder wall. This allows the bladder to store more urine without triggering the urgency sensation, reducing the number of trips to the washroom and episodes of urinary incontinence.
Reduces Urgency
Relaxes the bladder muscle to decrease the sudden, strong urge to urinate that characterizes OAB.
Decreases Frequency
Helps the bladder hold more urine, reducing how often patients need to go throughout the day and night.
Controls Incontinence
Reduces accidental urine leakage episodes associated with sudden urges — improving confidence and quality of life.
How to Take Generic Mirabegron
| Detail | Information |
|---|---|
| Starting dose | 25 mg once daily |
| Maintenance dose | 25 mg or 50 mg once daily (based on response & tolerability) |
| With or without food | ✓ May be taken with or without food |
| Swallowing | Swallow tablet whole — do not crush, chew, or split |
| Timing | Take at the same time each day |
| Onset of effect | Some improvement may be seen within 4–8 weeks |
| Full benefit | Up to 8 weeks or longer for maximum effect |
| Missed dose | Skip the missed dose; resume regular schedule. Do not double dose. |
Who is Mirabegron For?
Generic Mirabegron (Myrbetriq) is indicated for adults with overactive bladder (OAB) presenting with one or more of the following symptoms:
Urinary Urgency
Sudden, compelling desire to urinate that is difficult to defer.
Urinary Frequency
Urinating more than 8 times in a 24-hour period.
Urgency Incontinence
Involuntary leakage of urine associated with a sudden urge to urinate.
Mirabegron may also be used in combination with solifenacin (VESIcare) for patients who require additional OAB control. Consult your prescriber to determine if combination therapy is appropriate.
Common Side Effects
Mirabegron is generally well tolerated. The most commonly reported side effects include:
Important: Patients should have their blood pressure monitored regularly while on mirabegron, as it may increase blood pressure. This medication is not recommended for patients under 18. Use with caution in patients with severe uncontrolled hypertension, severe hepatic or renal impairment, or bladder outlet obstruction.
Notable Drug Interactions
Mirabegron inhibits CYP2D6 and may increase plasma levels of drugs metabolized by this pathway. Advise patients to inform their pharmacist and physician of all medications they take. Notable interactions include:
| Drug | Interaction Note |
|---|---|
| Warfarin (Coumadin) | May increase warfarin levels — monitor INR |
| Digoxin | Increased digoxin exposure — use lowest effective digoxin dose |
| Metoprolol / Desipramine | CYP2D6 substrates — increased plasma concentrations possible |
| Flecainide / Propafenone | Increased concentrations — use with caution |
| Thioridazine | Avoid concomitant use |
Who Should Not Take Mirabegron?
Mirabegron is contraindicated in patients with a known hypersensitivity to mirabegron or any component of the formulation. Signs of a serious allergic reaction include hives, difficulty breathing, and swelling of the face, lips, tongue, or throat — seek emergency medical attention immediately if these occur.
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