A patient with Parkinson's disease is prescribed a medication to help manage tremors. This drug acts by blocking muscarinic receptors in the central nervous system. Which of the following adverse effects is most likely to be experienced by this patient?

The correct answer to the question "A patient with Parkinson's disease is prescribed a medication to help manage tremors. This drug acts by blocking muscarinic receptors in the central nervous system. Which of the following adverse effects is most likely to be experienced by this patient?" is Option D: Urinary retention.

The other options — A) Diarrhea, B) Bradycardia, C) Increased salivation — are incorrect for this USMLE Exam Prep question. As explained above: Antimuscarinic drugs block cholinergic receptors, leading to anticholinergic side effects. These include dry mouth, blurred vision, constipation, tachycardia, and urinary retention. Diarrhea, bradyca…