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Pharmacology · single question

A patient taking amitriptyline (a tricyclic antidepressant) presents with xerostomia, with no clinical findings or history suggestive of Sjögren's syndrome or sialolithiasis. What is the most likely cause of the dry mouth?

  1. The medication itself (anticholinergic side effects of tricyclic antidepressants are a very common, well-documented cause of drug-induced xerostomia)
  2. Sjögren's syndrome, presumed without supporting findings
  3. Sialolithiasis, presumed without supporting findings
  4. Normal aging alone, unrelated to medication
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Correct answer: A. The medication itself (anticholinergic side effects of tricyclic antidepressants are a very common, well-documented cause of drug-induced xerostomia)

Tricyclic antidepressants like amitriptyline have significant anticholinergic activity, and medication-induced xerostomia is one of the most common, well-documented causes of dry mouth overall — far more common than Sjögren's syndrome or sialolithiasis. Without supporting clinical findings (e.g., dry eyes, positive autoantibodies, palpable salivary stone) for either of those other conditions, the most parsimonious and well-supported explanation is the medication itself.

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