A male client tells the nurse that he obtained sildenafil without a prescription over the internet, and asks the nurse if it is safe to take. In addition to advising the client to obtain medical evaluation, it is important that the nurse immediately determines if he takes which other type of medication?

A. Statins, such as atorvastatin: Statins primarily lower cholesterol and have no significant interaction with sildenafil that would cause an urgent safety concern. Although monitoring for muscle-related side effects is important with statins, it is not the priority here.B. Analgesics, such as acetaminophen: Acetaminophen is generally safe and does not interact dangerously with sildenafil. There is no immediate concern related to combining these two medications.C. Anticoagulants, such as warfarin: There is a potential for increased bleeding risk when sildenafil is combined with anticoagulants, but this is generally not an acute, life-threatening interaction requiring immediate determination before other more critical concerns.D. Nitrates, such as nitroglycerin: Taking sildenafil with nitrates can cause profound, life-threatening hypotension. Both sildenafil and nitrates can cause vasodilation, and their combined use can lead to a dangerous and potentially fatal drop in blood pressure. This combination is absolutely contraindicated, and the nurse must immediately assess whether the client uses any nitrate medication to prevent a serious adverse event.