Pipenzolate bromide is an

antimuscarinic A muscarinic receptor antagonist (MRA) is a type of anticholinergic agent that blocks the activity of the muscarinic acetylcholine receptor. The muscarinic receptor is a protein involved in the transmission of signals through certain parts of th ...

. It binds to

muscarinic acetylcholine receptor Muscarinic acetylcholine receptors, or mAChRs, are acetylcholine receptors that form G protein-coupled receptor complexes in the cell membranes of certain neurons and other cells. They play several roles, including acting as the main end-rec ...

s as an antagonist therefore preventing acetylcholine from binding to the receptors.

References

Muscarinic antagonists Quaternary ammonium compounds Piperidines Tertiary alcohols {{gastrointestinal-drug-stub