Pharmacology · single question

Amoxicillin can interact with all of the following EXCEPT:

  1. Oral contraceptives
  2. Warfarin
  3. Methotrexate
  4. Analgesics (NSAIDs/acetaminophen)
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Correct answer: D. Analgesics (NSAIDs/acetaminophen)

  • A. Amoxicillin can reduce the efficacy of oral contraceptives by altering gut flora and reducing enterohepatic circulation of estrogen.
  • B. Amoxicillin can potentiate warfarin's anticoagulant effect by reducing vitamin K-producing gut bacteria, increasing bleeding risk.
  • C. Amoxicillin can increase methotrexate toxicity by reducing renal excretion of methotrexate.
  • D. Analgesics (NSAIDs and acetaminophen) do not have significant pharmacokinetic interactions with amoxicillin. They can be safely co-administered for dental pain management. ✓

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