This document discusses treatments for detrusor overactivity (OAB), including anticholinergic/antimuscarinic drugs and mirabegron. It provides statistics on the prevalence and projected increase of OAB worldwide. Anticholinergics work by blocking muscarinic receptors in the bladder to reduce contractions. Mirabegron is a beta-3 adrenergic agonist that works differently by activating beta-3 receptors to relax the detrusor muscle. The document reviews the mechanisms and side effect profiles of various anticholinergic drugs and mirabegron as alternatives or additions for treating OAB.