Warfarin therapy is prolonged by all except______________?
Correct answer: A. Rifampicin
- A. Rifampicin
- B. Amoxycillin
- C. Erythromycin
- D. Tetracycline
Explanation
Rifampicin induces hepatic drug-metabolising enzymes and increases warfarin breakdown, thereby shortening its anticoagulant effect and lowering the INR. Erythromycin, tetracyclines, and sometimes amoxicillin tend to prolong or enhance warfarin action.
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