Vitamin D2 and Vitamin K Supplementation with Eliquis (Apixaban)
Yes, you can safely take both vitamin D2 (ergocalciferol) and vitamin K while on Eliquis (apixaban), as neither vitamin interacts with apixaban's anticoagulant mechanism.
Why This Combination Is Safe
Apixaban's Mechanism Does Not Involve Vitamin K
- Apixaban is a direct Factor Xa inhibitor that works independently of the vitamin K clotting pathway, unlike warfarin which directly antagonizes vitamin K 1, 2
- The European Heart Rhythm Association explicitly distinguishes NOACs (including apixaban) from vitamin K antagonists, noting that NOACs have "fewer food and drug interactions compared with VKAs" 1
- Vitamin K supplementation does not reverse or interfere with apixaban's anticoagulant effect, as confirmed in the FDA label which states "vitamin K is not expected to affect the anticoagulant activity of apixaban" 2
No Pharmacokinetic Interaction with Vitamins
- Apixaban is metabolized primarily by CYP3A4 and P-glycoprotein transporters 3, 4
- Neither vitamin D2 nor vitamin K affects these metabolic pathways 3
- Vitamin D2 supplementation has well-established effects on calcium and parathyroid hormone but does not interact with anticoagulation systems 5
Important Distinction: Vitamin K vs. Warfarin
- If you were taking warfarin (Coumadin) instead of Eliquis, vitamin K supplementation would be problematic because warfarin works by blocking vitamin K's role in clotting factor synthesis 6
- With apixaban (Eliquis), this concern does not apply—you have complete freedom to take vitamin K-containing foods and supplements 1, 2
Actual Drug Interactions to Avoid with Eliquis
High-Risk Combinations That Increase Bleeding
- NSAIDs (including celecoxib, ibuprofen, naproxen): Increase GI bleeding risk by more than 10-fold when combined with anticoagulants 7, 2
- Aspirin: Causes 2- to 5-fold increase in bleeding events, particularly when combined with anticoagulants 7, 2
- Other anticoagulants or antiplatelet agents: Dramatically increase bleeding risk 2
- SSRIs/SNRIs: Impair platelet function and increase bleeding risk 2
Medications That Alter Apixaban Levels
- Strong CYP3A4 and P-glycoprotein inhibitors (e.g., ritonavir in Paxlovid, ketoconazole): Significantly increase apixaban concentrations 8, 3
- Strong CYP3A4 and P-glycoprotein inducers (e.g., rifampin, carbamazepine): Decrease apixaban levels and reduce efficacy 3, 4
Practical Recommendations
- Continue your vitamin D2 and vitamin K supplements without dose adjustment while on Eliquis 1, 2
- Standard vitamin D2 dosing of 200,000 IU per day for deficiency treatment is safe and does not require modification for apixaban use 9
- Monitor for signs of bleeding (unusual bruising, prolonged bleeding, blood in urine or stool) as you would with any anticoagulant, but this is not increased by vitamin supplementation 2
- Avoid adding NSAIDs or aspirin to your regimen, as these create genuine bleeding risks with apixaban 7, 2
Common Pitfall to Avoid
- Do not confuse apixaban (Eliquis) with warfarin (Coumadin)—the dietary and supplement restrictions that apply to warfarin patients do not apply to you 1, 2
- The FDA label explicitly states that protamine sulfate and vitamin K "are not expected to affect the anticoagulant activity of apixaban," confirming no interaction exists 2