Apixaban Interactions with B-Complex Vitamins

Pharmacokinetic Interactions

Apixaban is metabolized primarily through CYP3A4 enzymes and P-glycoprotein (P-gp)/BCRP transporters, and clinically significant interactions occur only with medications that are moderate to strong inhibitors or inducers of BOTH CYP3A4 AND P-gp pathways simultaneously, according to the American Heart Association 1
B-complex vitamins (thiamine, riboflavin, niacin, B6, B12, folate, biotin, pantothenic acid) do not interact with CYP3A4 or P-gp metabolic pathways and therefore pose no pharmacokinetic risk with apixaban, as stated by the American College of Cardiology 1

Monitor for unusual bleeding or bruising as routine practice for all patients on apixaban, as recommended by the American College of Cardiology 2
No dose adjustment of apixaban is required when adding B-complex vitamins, according to the American Heart Association 2
Individual patient factors such as age, renal function, and other concomitant medications should still be assessed, as suggested by the National Comprehensive Cancer Network 2

Avoid combining apixaban with antiplatelet agents or NSAIDs without careful risk-benefit assessment, as these combinations substantially increase bleeding risk, according to the American Society of Clinical Oncology 3
Patients with severe renal impairment or severe hepatic impairment require special consideration for apixaban dosing regardless of vitamin supplementation, as recommended by the National Comprehensive Cancer Network 4