A nurse is caring for a client who has a prescription for nifedipine. Which of the following findings should the nurse assess prior to administration of the medication?

A. Temperature: Nifedipine does not directly affect body temperature, so assessing temperature is not critical prior to administration. B. Respiratory rate: While monitoring respiratory status is important in general, nifedipine primarily affects the cardiovascular system, so respiratory rate is not the primary assessment focus. C. Blood pressure: Nifedipine is a calcium channel blocker that lowers blood pressure by relaxing vascular smooth muscle. Assessing blood pressure before administration ensures the client is not hypotensive and helps prevent adverse cardiovascular effects. D. Oxygen saturation: Oxygen saturation is not directly impacted by nifedipine, so it is not essential to assess this parameter prior to giving the medication.