Mirabegron is a medication primarily used to treat overactive bladder (OAB) with symptoms such as frequent urination, urgency, and incontinence. It works by relaxing the bladder muscles, allowing the bladder to hold more urine and reducing the need to urinate frequently. It is classified as a beta-3 adrenergic agonist. Unlike other medications for OAB, Mirabegron does not affect the muscles involved in urination directly but rather works by stimulating beta-3 receptors in the bladder. This drug is commonly prescribed when other treatments, such as anticholinergic medications, are not effective or are not tolerated by the patient. It is typically taken once daily and can be used alone or in combination with other OAB treatments.