【正确答案】 B

【答案解析】Administering amitriptyline (a tricyclic antidepressant) and phenelzine (a monoamine oxidase [MAO] inhibitor) together could cause hypertension, tachycardia, or a potentially fatal reaction; the nurse should call the physician to check the order. The other options are important nursing actions, but they don't take priority over calling the physician.