Garlic and Betrixaban: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Jul 11, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Betrixaban
Garlic
No brand names on record
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
What happens
Increased risk of bleeding
Interaction Deep Dive
The antiplatelet effect of garlic may add to the effect of anticoagulants, increasing the risk for bleeding complications. Elevated international normalized ratio (INR) has been reported in patients initiating garlic who had previously been stabilized on warfarin1. Garlic has been shown to inhibit platelet aggregation when taken orally 2345. Given orally to humans, garlic increased fibrinolytic activity possibly through activated plasminogen 5.
Why it happens (mechanism)
Additive anticoagulant effects; garlic may inhibit platelet aggregation through reduced thromboxane B2; increased fibrinolytic activity
Literature reports
4 reports — tap to read
a) Two cases of increased international normalized ratios (INR) have been reported in patients previously stabilized on warfarin who started garlic supplements. The author attributed the doubling of "clotting times" to ingestion of garlic pearls or tablets, which was the only change introduced into the patients' regimens. Doses and timeframes for this observation were not provided 1.
b) Epidural hematoma and other bleeding consequences have been described in case reports when patients consumed garlic without concomitant medications known to affect blood coagulation 678.
c) Given orally to humans, garlic increased fibrinolytic activity possibly through activated plasminogen 5. The ability of garlic to affect platelet aggregation depends on the product preparation, with different products containing different active constituents 9.
d) Garlic has been shown to inhibit platelet aggregation when taken orally 2345.
Common questions
Can I take Garlic and Betrixaban together?
Increased risk of bleeding Always confirm with your pharmacist or prescriber before making any change.
How serious is the Garlic and Betrixaban interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "delayed". Effects tend to build up gradually over days to weeks.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Garlic or Betrixaban need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (9)
- Sunter W: Warfarin and garlic. Pharm J 1991; 246:722.
- Kiesewetter H, Jung F, Jung EM, et al: Effects of garlic coated tablets in peripheral arterial occlusive disease. Clin Invest 1993; 71:383-386. PubMed
- Kiesewetter H, Jung F, Jung EM, et al: Effect of garlic on platelet aggregation in patients with increased risk of juvenile ischemia attack. Eur J Clin Pharmacol 1993a; 45:333-336.
- Legnani C, Frascaro M, Gauzzaloca G, et al: Effects of a dried garlic preparation on fibrinolysis and platelet aggregation in healthy subjects. Arzneimittelforschung 1993; 43(2):119-122.
- Harenberg J, Giese C, & Zimmermann R: Effect of dried garlic on blood coagulation, fibrinolysis, platelet aggregation and serum cholesterol levels in patients with hyperlipoproteinemia. Atheroscler 1988; 74(3):247-249. PubMed
- Burnham BE: Garlic as a possible risk for postoperative bleeding. Plast Reconst Surg 1995; 95:213. DOI
- German K, Kumar U, & Blackford HN: Garlic and the risk of TURP bleeding. Br J Urol 1995; 76:518. PubMed
- Rose KD, Croissant PD, Parliament CF, et al: Spontaneous spinal epidural hematoma with associated platelet dysfunction from excessive garlic ingestion: a case report. Neurosurg 1990; 26:880-882. DOI
- Lawson LD, Ransom DK, Hughes BG, et al: Inhibition of whole blood platelet-aggregation by compounds in garlic clove extracts and commercial garlic products. Thromb Res 1992; 65:141-156. DOI
Keep reading about Betrixaban
Keep reading about Garlic
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
Check another combination
Our instant two-drug interaction checker is almost here.
Still have questions about this combination?
Every question gets a real answer from a licensed pharmacist — free, and usually within a day.
Ask the pharmacist