Tranexamic Acid Drug Interactions: What to Avoid and What to Tell Your Doctor

Tranexamic acid (TXA) has a generally clean drug interaction profile — but there are several important interactions that patients and providers need to know. Some are contraindicated (meaning you should never combine them), while others require caution or monitoring. Here's a complete guide to tranexamic acid drug interactions in 2026.

Major (Contraindicated) Drug Interactions

These combinations carry a risk of serious, life-threatening harm and should be avoided entirely:

Factor IX Concentrates and Prothrombin Complex Concentrates (PCCs)

Combining tranexamic acid (especially IV) with Factor IX concentrates or prothrombin complex concentrates (like Kcentra) is contraindicated. Both agents promote clot stabilization through different pathways, and the combination dramatically increases the risk of arterial or venous thrombosis (blood clots in arteries or veins) — potentially causing stroke, heart attack, or pulmonary embolism.

This interaction is particularly relevant for hemophilia B patients (who use Factor IX concentrates), and for patients receiving PCCs for reversal of anticoagulation. When these products are needed, TXA must be withheld.

Anti-Inhibitor Coagulant Complex (FEIBA)

FEIBA (Factor Eight Inhibitor Bypassing Activity) is used in hemophilia A patients with inhibitors. Combining FEIBA with tranexamic acid significantly increases the risk of thromboembolism. This combination should be avoided or used only with extreme caution and hematology oversight.

Moderate Drug Interactions

These interactions don't necessarily require avoiding the combination entirely, but they warrant careful consideration and discussion with your doctor:

Hormonal Contraceptives (Estrogen-Containing Pills, Patches, Rings)

This is one of the most clinically relevant interactions for women taking tranexamic acid for heavy periods. Combined hormonal contraceptives (pills, patches, or rings containing estrogen) already increase baseline clot risk. Adding tranexamic acid — an antifibrinolytic that prevents clot breakdown — further amplifies this risk.

The FDA prescribing information for tranexamic acid oral tablets states this combination is not recommended. If you need contraception while taking TXA, discuss non-hormonal options (copper IUD, condoms, diaphragm) or progestin-only options (mini-pill, hormonal IUD, implant) with your provider.

Defibrotide

Defibrotide (Defitelio) is used to treat hepatic veno-occlusive disease (VOD). Tranexamic acid may diminish its effects via pharmacodynamic antagonism — defibrotide promotes fibrinolysis (clot breakdown) while TXA inhibits it. These agents work in opposite directions. If a patient needs both, careful monitoring and specialist input are required.

Tremelimumab and Other Immune Checkpoint Inhibitors

Some oncology agents may affect coagulation and fibrinolysis in ways that interact with TXA. Patients in active cancer treatment should have their full medication list reviewed by their care team before starting tranexamic acid.

Food and Supplement Interactions

Tranexamic acid has minimal known interactions with food. It can be taken with or without food — in fact, taking it with food is often recommended to reduce nausea. No significant dietary restrictions apply.

Supplements to discuss with your doctor:

Fish oil / omega-3 fatty acids: High doses can mildly reduce platelet aggregation. Relevance to TXA is low, but mention to your doctor.

Vitamin E: Very high doses may have anticoagulant-like effects. Disclose all supplements to your provider.

Ginkgo biloba: May affect platelet function. Mention to your doctor if you use this supplement.

What About Anticoagulants (Warfarin, Xarelto, Eliquis)?

Anticoagulants reduce the ability of blood to clot, while tranexamic acid prevents clots from dissolving. These two effects partially counteract each other. The combination is not absolutely contraindicated, but it is complex: in some settings (like perioperative dental procedures in patients on anticoagulants), TXA mouthwash is actually used alongside continued anticoagulation. However, systemic oral or IV TXA combined with anticoagulants requires careful assessment. Always disclose any anticoagulant therapy before starting TXA.

What to Tell Your Doctor and Pharmacist

Before starting tranexamic acid, make sure your provider and pharmacist know about:

All prescription medications (especially contraceptives, anticoagulants, clotting factors)

All over-the-counter medications (including aspirin and NSAIDs)

All vitamins, minerals, and herbal supplements

Any personal or family history of blood clots, clotting disorders, or thrombophilia

The Bottom Line

The most critical interaction to remember is that tranexamic acid should never be combined with Factor IX concentrates or prothrombin complex concentrates. For most other patients, the main concern is the combination with estrogen-containing hormonal contraceptives, which raises clot risk meaningfully. Always give your full medication and supplement list to your prescriber. For more on side effects to watch for, see our guide on tranexamic acid side effects.