The short answer
Not known in people. We found no study that measured how triphala changes the absorption of any medicine in people, and no timing gap between the two has been tested. In a 2022 study, triphala slowed four liver enzymes that break down many drugs, and rats given triphala ended up with about 61% more of one test drug in the blood and 41% more of another.
So the question is not only whether triphala blocks a medicine. It may also raise the amount that reaches the blood. That matters most for medicines where small changes count, such as levothyroxine for the thyroid. If you take triphala alongside a regular medicine, tell your prescribing doctor, and ask how the two should be timed.
At a glance
| What was seen | How it may work | Direction | Evidence |
|---|---|---|---|
| Slowed four drug-processing liver enzymes (CYP1A2, CYP3A4, CYP2C9, CYP2D6)[1] | Enzyme inhibition in human liver tissue in the lab; no effect on the P-gp drug pump in gut cells | Could raise levels of drugs these enzymes clear | In vitro |
| More of two test drugs (phenacetin, midazolam) in the blood of rats[1] | Thought to be enzyme inhibition | More drug in the blood, not less | 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. It slowed CYP1A2 and CYP3A4 most strongly, then CYP2C9, and CYP2D6 only weakly. In gut cells grown in the lab, it did not affect P-gp, a pump that pushes some drugs back out of the gut. 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 were given triphala by mouth along with phenacetin or midazolam, two drugs used to test these enzymes. The amount of drug that reached the blood rose by about 61% for phenacetin and 41% for midazolam. The rats were given 500 mg of triphala per kg of body weight, and this animal experiment does not set a safe timing gap for people. Animal results show the question is worth asking. They cannot tell us what happens in people.[1]
What your doctor may watch for
- Levothyroxine has a narrow therapeutic index, so small changes in how much is absorbed can matter.[2]
- Whether your regular medicines are still working as expected, and blood levels for medicines that are already monitored that way.
What to tell your prescribing doctor
You can read this out, or show them this page:
“I take triphala (name of product, how much, and at what time of day) along with my regular medicines. A lab and rat study found triphala can change how the body handles some drugs. How should I time it with my medicines, and do any of them need closer checking?”
Withheld until review
Questions people ask
Does triphala stop other medicines from working?
The one study we found points the other way. In rats, triphala increased the amount of two test drugs in the blood. Whether this happens in people, and with which medicines, has not been studied.[1]
Can triphala affect the birth control pill?
The study on this page did not test contraceptive pills. If you rely on the pill and take triphala, ask your doctor or pharmacist about your particular pill and triphala product.[1]
Related
Triphala 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.
InteractionHaritaki (harad) and other medicines you swallow
We found no study of haritaki and medicine absorption. One patient's antidepressant seemed to stop working on herbal mixtures with haritaki.
InteractionTriphala and laxatives
Triphala may add to another laxative's effect. The one small study in people tested a triphala, senna and isabgol mix, not separate products.
InteractionTriphala and blood thinners like warfarin
No study has tested triphala with warfarin. In the lab, triphala slowed an enzyme that breaks warfarin down, which could strengthen its effect.
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.
- Levothyroxine 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
Taking triphala with other medicines? A vaidya can check your full list.
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