Which of the following medication classes used to treat Parkinson's disease has relaxing effects on smooth musculature both directly and indirectly through parasympathetic nervous system inhibition?

Question

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Anticholinergics such as benztropine and trihexyphenidyl are commonly used to treat Parkinson's disease. They work by inhibiting the parasympathetic nervous system, which leads to relaxation of smooth musculature. This effect is both direct and indirect, as the inhibition of the parasympathetic nervous system results in decreased acetylcholine activity, which further leads to muscle relaxation.

Which of the Following Medication Classes Used to Treat Parkinson's