methacholine(redirected from Metacholine)
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Related to Metacholine: Methacholine challenge test
a cholinergic agonist, having a longer duration of action than acetylcholine and predominantly muscarinic effects. It has vasodilator and cardiac vagomimetic effects but has largely been replaced by other drugs. It is also used in bronchial challenge tests.
a synthetic choline ester with pharmacological effects similar to those of acetyl choline, but has little effect on alimentary tract and is little used in veterinary medicine.