Which medication requires caution for somnolence because the client can fall asleep during regular activities?

• A. Ropinirole
• B. Selegiline
• C. Entacapone
• D. Benztropine

Answer: (A)

Dopamine agonists can cause daytime sleepiness and even sudden sleep attacks, so patients need to be cautious with activities like driving or operating machinery. Ropinirole, a dopamine agonist used in Parkinson disease, is well known for this risk. It can produce somnolence that lasts into the day, especially when starting therapy or adjusting the dose, so patients are advised to avoid driving until they know how it affects them and to monitor for sudden episodes of sleep. Alcohol and other sedatives can worsen this effect, so caution with those as well.

The other medications listed have different dominant side effects. Selegiline is mainly a MAO-B inhibitor that can cause insomnia or mood changes rather than daytime sleepiness. Entacapone is a COMT inhibitor with gastrointestinal or dyskinesia-related effects, not primarily somnolence. Benztropine is an anticholinergic with dry mouth, blurred vision, urinary retention, and confusion risk rather than a prominent risk of falling asleep during normal activities.