Pharmacology · single question
Which medication is LEAST likely to cause xerostomia (dry mouth)?
Show answer and explanation
Correct answer: D. Acetaminophen
- A. Amitriptyline (a tricyclic antidepressant) has strong anticholinergic effects and is a classic cause of xerostomia.
- B. Hydrochlorothiazide (a diuretic) commonly causes dry mouth via fluid loss.
- C. Diphenhydramine (an antihistamine) has anticholinergic properties and commonly causes xerostomia.
- D. Correct. Acetaminophen has no significant anticholinergic or diuretic properties and is not associated with xerostomia, making it the least likely to cause dry mouth among these options.