Question

a nurse is teaching an adult client about diphenhydramine. the nurse should inform the client to expect which of the following adverse effects while taking this medication?
muscle tremors
drowsiness
excitation
insomnia

Explanation:

Diphenhydramine is a first-generation antihistamine that readily crosses the blood-brain barrier, leading to central nervous system depression. The most common and classic adverse effect in adult clients is drowsiness. Muscle tremors, excitation, and insomnia are not typical primary adverse effects for adults; excitation can sometimes occur in pediatric patients, but not the standard expectation for adults.

Answer:

B. Drowsiness