>5 years, 2.5–5 mg 2–3 times daily. Products OXYBUTYNIN TABS 5 MG (AS HCL) (DITROPAN® )   SOLIFENACIN Mode of action Solifenacin is a competitive muscarinic acetylcholine receptor antagonist . The binding of acetylcholine to these receptors, particularly the M3 receptor subtype, plays a critical role in the contraction of smooth muscle . By