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How can you determine whether sildenafil is clinically appropriate, given the patient’s other regular medication?

Before deciding whether sildenafil is appropriate, you need to check the interactions between sildenafil and the patient’s current regular medication. You choose the interactions checker from the menu pane, enter all four drugs — cimetidine, aspirin, atorvastatin and sildenafil — into the search field (4). This search brings up all the relevant interactions. You see that cimetidine increases the plasma concentration of sildenafil, and the recommended dose the patient uses is 25mg to begin with (5).

Source  Sample images were obtained using an iOS device