An older adult with COPD and chronic atrial fibrillation has been on a stable dose

An older adult with COPD and chronic atrial fibrillation has been on a stable dose of warfarin for over a year, with INR values between 2.0 and 2.8. Recently, they were admitted to the hospital with a severe urinary tract infection. They present for a post-hospital visit. Their urinary symptoms have resolved, but their gums bleed easily. Their current medications are warfarin, trimethoprim/sulfamethoxazole, terazosin, theophylline, low-dose aspirin, and OTC ginkgo biloba. Blood tests show that their INR is now 6.8. Which of the following medications is LEAST likely to be contributing to the bleeding and altered INR? A. Trimethoprim/sulfamethoxazole B. Terazosin C. Theophylline D. Aspirin

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