Betmiga 50 mg contains prolonged-release mirabegron, a prescription medicine for urgency, increased urinary frequency and urge leakage associated with overactive bladder. Take once daily as prescribed and swallow the tablet whole; do not crush or chew it. Blood pressure should be checked because mirabegron can raise it, and prompt advice is needed for severe headache, palpitations, inability to pass urine or swelling of the face or throat.