Muscarinic antagonist
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In neurochemistry, a muscarinic receptor antagonist is an agent that reduces the activity of the muscarinic acetylcholine receptor. Acetylcholine (often abbreviated ACh) is a neurotransmitter, whose receptor is a protein found in synapse and other cell membranes. Besides responding to their primary neurochemical, neurotransmitter receptors can be sensitive to a variety of other molecules. Acetylcholine receptors are classified into two groups based on this - muscarinic, which also respond to muscarine, and nicotinic which respond to nicotine.
Most muscarinic receptor antagonists are synthetic, but scopolamine and atropine are belladonna alkaloids, and are naturally extracted.
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