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Review Question - QID 215165

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QID 215165 (Type "215165" in App Search)
A 54-year-old man presents to his primary care physician with a 10-month history of intermittent chest pain. He states that the pain occurs when he is walking in the mall and improves with rest. He reports that the pain feels like someone is pushing on his chest, but it does not radiate anywhere. His past medical history is significant for hypertension but he is not currently taking any medications, though he occasionally uses sildenafil for erectile dysfunction. Based on these findings, his physician prescribes several medications but states that one of them must only be used if he stops taking sildenafil. Which of the following is an important drug interaction for the medication described in this case?