The short answer
Not known in people. We found no study that tested triphala with warfarin. In a 2022 lab study on human liver tissue, triphala slowed CYP2C9, one of the enzymes that break down warfarin. In rats it raised blood levels of two other test drugs. If the same happened with warfarin, its blood-thinning effect could get stronger.
Warfarin leaves little room between too little and too much, and its label asks for close INR checks when herbal products are used. A raised INR means blood takes longer to clot, which raises the risk of bleeding. If you take warfarin or acenocoumarol, tell your prescribing doctor before you start triphala, and ask whether your INR should be checked more often.
Warfarin is sold in India as Warf. Acenocoumarol, a related blood thinner, is sold as Acitrom.
At a glance
| What was seen | How it may work | Direction | Evidence |
|---|---|---|---|
| Slowed CYP2C9, an enzyme that clears warfarin[1] | Enzyme inhibition in human liver tissue in the lab | Could raise warfarin levels and its effect; not measured in people | In vitro |
| More of two other test drugs in the blood of rats[1] | Thought to be enzyme inhibition | Shows triphala can raise drug levels in a living animal; warfarin was not tested | Animal |
No listing is not a clearance. A missing interaction here never means a combination is safe.
The evidence, study by study
Laboratory study, 2022 In vitro
Researchers added triphala to human liver microsomes, the drug-processing part of liver cells, and measured four enzymes. Triphala slowed all four, including CYP2C9, which helps clear warfarin. Warfarin itself was not part of the study. Lab findings like this show a possible route for an interaction. They do not show that one happens in people.[1]
Rat study, 2022 Animal
In the same paper, rats given triphala by mouth (500 mg per kg of body weight) absorbed about 61% more phenacetin and 41% more midazolam, two drugs used to test liver enzymes. Neither is a blood thinner. Animal results show the question is worth asking. They cannot tell us what happens in people.[1]
What your doctor may watch for
- Your INR. Warfarin has a narrow therapeutic range, so a small change in its effect can matter.[2]
What to tell your prescribing doctor
You can read this out, or show them this page:
“I am taking, or planning to take, triphala (name of product, how much, how often) along with my blood thinner. A lab study found triphala can slow an enzyme that breaks down warfarin. Should my INR be checked more often?”
Withheld until review
Questions people ask
Is triphala a blood thinner?
We did not find studies of triphala's own effect on clotting in people. The concern with warfarin is a different one: whether triphala slows how fast the body clears the drug.[1]
Related
Triphala with other medicines: timing and absorption
No study in people has tested triphala's effect on other medicines, or any timing gap. In rats, triphala raised the levels of two test drugs.
InteractionHaritaki (harad) and warfarin
We found no study of haritaki with warfarin. A rat study found no effect on the main enzyme that clears warfarin, but slowed a minor one.
InteractionAmla and blood thinners
Amla extract slowed platelet clumping in small human studies, alone and with aspirin or clopidogrel. Warfarin has not been tested.
FormulationTriphala Churna
Three fruits in one powder, best known as a laxative. Human trials are few and small; most research is in the lab or in animals.
Sources
- Nontakham J, Siripong P, Sato H, Chewchinda S, Arunrungvichian K, Yahuafai J, Goli AS, Sato VH. Inhibitory effects of Triphala on CYP isoforms in vitro and its pharmacokinetic interactions with phenacetin and midazolam in rats. Heliyon. 2022;8(6):e09764. PMID 35785236.
- Jantoven (warfarin sodium) tablets, US prescribing information (DailyMed).
Awaiting review by The Good Vaidya Medical Board. Prepared from the sources below and checked against each one.
Published 4 November 2026 · Last updated 4 November 2026
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