Mirabegron is a medication used to treat overactive bladder (OAB) symptoms, including urinary frequency, urgency, and incontinence. It works by stimulating beta-3 adrenergic receptors in the bladder, leading to relaxation of the detrusor muscle and increased bladder capacity. This action helps reduce the symptoms of OAB. Mirabegron is typically taken once daily, with or without food, and should be swallowed whole without crushing or chewing. Common side effects may include increased blood pressure, urinary tract infections, headache, and constipation. It is important to monitor blood pressure regularly during treatment, as mirabegron can cause an increase in blood pressure. Patients with severe kidney or liver problems should use this medication with caution and may require dose adjustments. Mirabegron is not recommended for use in children under 3 years old. If you experience swelling of the face, lips, tongue, or throat, or have difficulty breathing, seek immediate medical attention, as these may be signs of a serious allergic reaction.