By: Steve P. Soman – Mirabegron (Mybetriq®), known also by the brand name Betanis®in Japan, is a new once daily oral drug.   First in its class, it is a selective β(3)-adrenoceptor agonist that improves symptoms associated with over active bladder (OAB) such as urinary incontinence, urgency, and urinary frequency by enhancing storage function and relaxing…