propantheline

Propantheline is an orally active antagonist of muscarinic acetylcholine receptors (mAChRs), commonly employed to investigate smooth muscle dysfunction, hyperhidrosis, smooth muscle spasms or cramps in the stomach, intestines, or bladder, as well as involuntary urination [1] [2] [3].

Propantheline bromide (Pro-Banthine) competitively antagonizes acetylcholine activity mediated by muscarinic receptors at neuroeffector sites on smooth muscle and exocrine gland cells. Propantheline Bromide is the bromide salt form of propantheline, a quaternary ammonium compound structurally related to belladonna alkaloids. An aspartic acid residue present in the N-terminal portion of the third transmembrane helix of the muscarinic receptor is believed to form an ionic bond with the tertiary or quaternary nitrogen of the antagonist. Antagonism leads to a reduction of exocrine glands secretions and to relax the bronchial muscle and reduce tone and motility of intestinal smooth muscle.