High Quality Content by WIKIPEDIA articles! Bethanechol is a parasympathomimetic choline carbamate that selectively stimulates muscarinic receptors without any effect on nicotinic receptors. Unlike acetylcholine, bethanechol is not hydrolyzed by cholinesterase and will therefore have a long duration of action. Bethanechol does not involve the action of the muscarinic M3 receptor subtype in-vitro (Benavides-Haro et al. (2003))