Final answer:
Drowsiness is a recognized adverse effect of the medication baclofen, which is prescribed to treat muscle symptoms in multiple sclerosis patients. Diarrhea, weight loss, and hypertension are not commonly associated with baclofen use.
Step-by-step explanation:
A nurse is collecting data from a client who has multiple sclerosis and a new prescription for baclofen. Among the options provided, the nurse should identify drowsiness as an adverse effect of this medication. Baclofen is a muscle relaxer and an antispastic agent used to treat muscle symptoms caused by multiple sclerosis, including spasm, pain, and stiffness. Common side effects of baclofen can include drowsiness, as well as other central nervous system effects like dizziness or weakness. Diarrhea, weight loss, and hypertension are not typically associated with the use of baclofen. It is important to monitor for any side effects and communicate with healthcare providers if adverse reactions occur.