A 55-year-old man comes to the physician because of constipation since starting an over-the-counter medication 2 weeks ago for a chronic, persistent cough and sinus congestion. Which of the following ingredients in this medication is the most likely cause of this patient's new symptom?
A) Acetaminophen
B) Dextromethorphan
C) Guaifenesin
D) Loratadine
E) Phenylephrine
A 55-year-old man comes to the physician because of constipation since starting an over-the-counter medication 2 week
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A 55-year-old man comes to the physician because of constipation since starting an over-the-counter medication 2 week
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