Trimethoprim-Sulfamethoxazole and Warfarin: What You Need to Know About INR Elevation
- by Lysander Beaumont
- Jan, 30 2026
Trimethoprim-sulfamethoxazole can cause dangerous INR spikes in people taking warfarin, increasing bleeding risk. Learn how this interaction works, who’s most at risk, and what to do if your INR rises.
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