Question

A 55-year-old patient on warfarin for atrial fibrillation requires antibiotics for a chest infection. Which antibiotic class is most likely to potentiate warfarin's anticoagulant effect?

Accepted Answer

Metronidazole and macrolides both

Answer

Macrolides (e.g., clarithromycin)

Answer

Penicillins (e.g., amoxicillin)

Answer

Cephalosporins (e.g., cefalexin)

Answer

Tetracyclines (e.g., doxycycline)

Practice question

A 55-year-old patient on warfarin for atrial fibrillation requires antibiotics for a chest infection. Which antibiotic class is most likely to potentiate warfarin's anticoagulant effect?