A nurse is preparing to administer amlodipine to a client. Which of the following vital signs should the nurse assess before administration?

A. Respiratory rate is not a critical assessment before administering amlodipine. B. Oxygen saturation is not directly affected by amlodipine, so it is not necessary to assess before administration. C. Temperature is not a priority assessment before administering amlodipine. D. Blood pressure should be assessed before administering amlodipine, as it is a calcium channel blocker used to treat hypertension, and it can lower blood pressure.