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A 58-year-old man comes to the emergency department due to a persistent, painful erection that has lasted 8 hours. His other medical conditions include ulcerative colitis, kidney stones, depression, insomnia, hypertension, drug-induced diabetes, obesity, and hypercholesterolemia. The patient does not use tobacco, alcohol, or recreational drugs. He takes prednisone, mesalamine, mirtazapine, insulin, trazodone, 6-mercaptopurine, simvastatin, glyburide, and enalapril. He has no known drug allergies. Vital signs are stable. Examination confirms the patient's chief complaint but is otherwise unremarkable. Which of the following medications is the most likely cause of his condition?
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