Ambutonium bromide is a

muscarinic antagonist A muscarinic acetylcholine receptor antagonist, also simply known as a muscarinic antagonist or as an antimuscarinic agent, is a type of anticholinergic drug that blocks the activity of the muscarinic acetylcholine receptors (mAChRs). The muscarin ...

References

Muscarinic antagonists Quaternary ammonium compounds {{gastrointestinal-drug-stub