The use of drugs such as benztropine (Cogentin) for Parkinson's disease is based on the premise that there is an overactivity of the neurotransmitter _____ in these patients.

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Parkinson's disease is characterized by a decrease in dopamine levels in the brain. However, benztropine (Cogentin) is used to treat Parkinson's disease because it blocks the overactivity of the neurotransmitter acetylcholine, which is in excess in Parkinson's disease due to the lack of dopamine inhibition.

The Use of Drugs Such as Benztropine (Cogentin) for Parkinson's