The nurse is preparing to administer a central nervous system (CNS) depressant to a client. Which clinical finding is most concerning to the nurse?

A. The client needs assistance when getting up: CNS depressants commonly cause sedation, dizziness, and impaired coordination. Needing assistance with ambulation reflects expected central nervous system effects. Fall precautions are appropriate, but this finding does not indicate an immediate life-threatening risk. B. The client's respiratory rate is 10: CNS depressants suppress the medullary respiratory center, reducing respiratory drive. A respiratory rate of 10 breaths per minute indicates respiratory depression and places the client at risk for hypoxia and hypercapnia. This finding requires immediate nursing intervention before administration. C. The client is experiencing mild nausea: Gastrointestinal upset may occur with many medications and is generally manageable with supportive care. Mild nausea does not indicate CNS toxicity or compromised vital function. It is not a contraindication to administration. D. The client's blood pressure is 148/92: Mild to moderate hypertension is not a typical adverse effect of CNS depressants. This blood pressure reading does not reflect acute instability related to sedative medications. Monitoring is appropriate, but it is not the priority concern.