Buscon (Hyoscine butylbromide) is a quaternary ammonium antimuscarinic agent. Hyoscine butylbromide does not readily pass the blood-brain barrier. It is a competitive antagonist of the actions of acetylcholine and other muscarinic agonists. It is used in the treatment of conditions associated with gastrointestinal spasm. It is available as 5's x 2 blistered 1 ml ampoule in each box.