Which drug class, when used with warfarin, increases bleeding risk?

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The key idea is that some drugs can raise the risk of bleeding when combined with warfarin. NSAIDs, like ibuprofen, do this because they both interfere with how clots form and can irritate the lining of the stomach. Warfarin lowers the blood’s ability to clot by reducing vitamin K–dependent clotting factors, and NSAIDs impair platelet function and can damage the GI lining, so together they make bleeding more likely, especially in the stomach or intestines. Other options listed don’t carry that same level of bleeding risk when paired with warfarin—acetaminophen is generally safer for bleeding risk, while statins and beta-blockers don’t significantly boost bleeding in this combination. If an NSAID is needed, use the lowest effective dose for the shortest time and monitor for signs of bleeding, or consider alternatives like acetaminophen when appropriate.