AI Article Synopsis
- Warfarin, an anticoagulant, requires dosage adjustments based on INR levels, and ascorbic acid may reduce its effectiveness, as shown in limited studies.
- A 63-year-old woman experienced warfarin resistance after taking ascorbic acid for anemia linked to breast cancer surgery; her INR stayed low even when her warfarin dosage was increased.
- Once ascorbic acid was discontinued, her INR quickly rose to target levels, suggesting a direct link between the vitamin C intake and the reduced warfarin effectiveness; patients taking both should closely monitor their INR and stop ascorbic acid if resistance occurs.
Article Abstract
Warfarin is an anticoagulant that requires INR-based dosage adjustment. Ascorbic acid may impair warfarin effectiveness according to limited literature. We report a rare case of a 63-year-old woman with an aortic valve replacement history who developed warfarin resistance after taking ascorbic acid for anemia following breast cancer surgery. Despite increasing the warfarin dose from 6 mg to 10 mg daily, her INR remained below the therapeutic range. After ruling out other causes of warfarin resistance, we discontinued ascorbic acid and observed a rapid increase in INR to target values. The temporal relationship and the absence of other confounding factors confirmed the causality of ascorbic acid in this case. We recommend that patients concomitantly taking vitamin C and warfarin should monitor their INR values closely and discontinue ascorbic acid as soon as possible if they exhibit signs of warfarin resistance.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11082382 | PMC |
| http://dx.doi.org/10.3389/fphar.2024.1390996 | DOI Listing |
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