Anticholinergic agents refer to medication drugs that block the action of acetylcholine , a neurotransmitter with an effect opposite to that of dopamine . By blocking the action of acetylcholine, these drugs increase the ability of dopamine to control movement. Examples of anticholinergic drugs used in the treatment of Parkinson disease include trihexyphenidyl (Artane®), benztropine (Cogentin®), and ethopropazine (Parsidol®).

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