– Dicyclomine (Dicycloverine) is a potent, orally active antagonist of muscarinic cholinergic receptors, specifically M1 and M2 subtypes, with Ki values of 5.1 nM and 54.6 nM in brush-border and basal plasma membranes, respectively [1] [2]. As an antispasmodic agent, it relieves smooth muscle spasm of the gastrointestinal tract in vivo.