MODERATE — Monitor Closely
Apigenin and Warfarin — Increased Bleeding Risk
Evidence level: MODERATE
Apigenin can slow down how your body processes Warfarin by blocking a liver enzyme (CYP2C9). This could make Warfarin more potent than expected, increasing the risk of dangerous bleeding.
Apigenin inhibits CYP1A2 and CYP2C9 enzymes. Warfarin (S-warfarin) is primarily metabolized by CYP2C9. Apigenin-mediated CYP2C9 inhibition may increase warfarin plasma levels, elevating bleeding risk. Apigenin also has mild antiplatelet activity.
CRITICAL: Inform your anticoagulation clinic that you take Apigenin. Request more frequent INR monitoring (weekly) when starting or stopping Apigenin. Do not change Apigenin dose without informing your prescriber. Watch for signs of bleeding.
CYP inhibition effects are cumulative. Timing separation does not eliminate the risk. Consistent daily dosing is more predictable than intermittent use.
Higher risk for: elderly patients, those with liver disease, history of GI bleeding, concurrent use of multiple blood thinners, recent surgery, vitamin K intake changes, alcohol use, or low body weight.
Unusual bruising, blood in urine or stool, prolonged bleeding from cuts, nosebleeds, dark tarry stools, blood in vomit.
Request INR monitoring when adding or removing Apigenin. Discuss CYP2C9 inhibition potential. Consider alternative non-CYP-active supplements if on warfarin.
Blood thinners have narrow safety margins. Instead of Apigenin, consider safer options: CoQ10 (with INR monitoring), vitamin D3, or probiotics — these have minimal anticoagulant interactions. Always inform your anticoagulation clinic about any supplements.
Apigenin can slow down how your body processes Warfarin by blocking a liver enzyme (CYP2C9). This could make Warfarin more potent than expected, increasing the risk of dangerous bleeding.
CYP inhibition effects are cumulative. Timing separation does not eliminate the risk. Consistent daily dosing is more predictable than intermittent use.
Unusual bruising, blood in urine or stool, prolonged bleeding from cuts, nosebleeds, dark tarry stools, blood in vomit.
Blood thinners have narrow safety margins. Instead of Apigenin, consider safer options: CoQ10 (with INR monitoring), vitamin D3, or probiotics — these have minimal anticoagulant interactions. Always inform your anticoagulation clinic about any supplements.
Request INR monitoring when adding or removing Apigenin. Discuss CYP2C9 inhibition potential. Consider alternative non-CYP-active supplements if on warfarin.
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