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PURPOSETo discuss the pharmacotherapeutic aspects of Mirabegron which is a first-in class novel β3 receptor agonist drug recently approved by the food and drug administration (FDA) for the treatment of overactive bladder (OAB).MATERIALS AND METHODSWe conducted a computerized search of the MEDLINE/PUBMED databases with the word Mirabegron, β3 receptor agonist and overactive bladder.RESULTSEffect of Mirabegron on β3 adrenergic receptor purportedly releases nitric oxide(NO) by an increase in intracellular Ca2+ through accumulation of cyclic adenosine monophosphate (cAMP). Along with NO which relaxes the detrusor muscle, it also releases an urothelial-derived inhibiting factor (UDIF) that inhibits contractions. It increases the bladder capacity by causing bladder relaxation during the storage phase.CONCLUSIONMirabegron appears to be a promising treatment in OAB patients by shifting its management from reducing detrusor over-activity to inducing relaxation. Also it lacks the troublesome side effects associated with the standard antimuscarinic management.

Mirabegron for overactive bladder: a novel, first-in-class 3-agonist therapy.