What is "methacholine"

n. A synthetic choline ester that alters the activity of muscarinic receptors in certain neurons.

n. parasympathomimetic drug (trademark Mecholyl) that stimulates secretions and smooth muscle activity [syn: Mecholyl]

Methacholine ( INN, USAN) (trade name Provocholine) is a synthetic choline ester that acts as a non-selective muscarinic receptor agonist in the parasympathetic nervous system.