A client is prescribed cyclobenzaprine (Flexeril) for the treatment of muscle spasticity associated with multiple sclerosis. Which statement below should the nurse emphasize to the client prior to administration?

The correct answer is C: Do not operate motor vehicles after taking cyclobenzaprine. Cyclobenzaprine is a muscle relaxant that can cause drowsiness and impair motor skills, making it unsafe to drive or operate machinery. This precaution is crucial for the safety of the client and others. Monitoring heart rate for bradycardia (choice A) is not a common side effect of cyclobenzaprine. Ensuring naloxone availability (choice B) is not relevant as cyclobenzaprine is not an opioid and naloxone is used for opioid overdose reversal. Excessive salivation (choice D) is not typically associated with cyclobenzaprine.