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Review Question - QID 212693

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QID 212693 (Type "212693" in App Search)
A 28-year-old man presents to his primary care physician because he has been experiencing constipation for the last 6 days. He says that the constipation started 1 day after he started taking an over the counter medication for sinus congestion and a chronic cough. He has no other findings associated with the constipation. His past medical history is significant for seasonal allergies but he is not currently taking any other medications besides the one he reported. Which of the following drugs was most likely responsible for this patient's symptoms?