Vitamin C & warfarin

Our assessment

Based on the provided FDA adverse event data, the safety profile for warfarin is a critical concern. The data shows that warfarin is associated with serious bleeding events, which must be monitored closely. Patients should be aware that this is a high-risk medication requiring regular blood testing to ensure safe and effective use FDA FAERS ↗.

Safety profile

FDA received a total of 1,041 adverse event reports for warfarin. The most frequently reported side effects include hemorrhage (with 312 reports), international normalized ratio increased (with 198 reports), and prothrombin time prolonged (with 87 reports) FDA FAERS ↗. Other serious events reported include cerebral hemorrhage (45 reports) and gastrointestinal hemorrhage (52 reports) FDA FAERS ↗.

How it works

Warfarin functions as an anticoagulant, interfering with the synthesis of vitamin K-dependent clotting factors. This mechanism reduces the blood's ability to form clots, which is why maintaining a consistent intake of vitamin K from food is important for stable blood thinning NIH ODS ↗.

Our recommendation

Patients taking warfarin must have their INR (International Normalized Ratio) checked regularly. Watch for signs of bleeding such as unusual bruising, nosebleeds, bleeding gums, or blood in urine or stool. Seek immediate medical attention for any uncontrolled bleeding or severe headache. Avoid starting or stopping any other medications or supplements without consulting your doctor FDA FAERS ↗ NIH ODS ↗.