The short answer
Probably. Piperine, the compound that gives pippali (long pepper) and black pepper their bite, is put into an Indian TB capsule called Risorine to raise how much rifampicin reaches the blood. Because of that boost, Risorine carries less rifampicin than a standard dose. In a trial of 216 patients, a regimen built on it worked about as well as standard TB treatment.
That measured product is different from adding pippali, pepper or a piperine supplement to your usual rifampicin. We found no study of that, so how much extra rifampicin would reach the blood is not known. If you are on TB treatment, tell your TB doctor before you take any product with pippali, black pepper extract or piperine.
Rifampicin is sold in India as R-Cin. In the US it is called rifampin.
At a glance
| What was seen | How it may work | Direction | Evidence |
|---|---|---|---|
| A rifampicin and piperine capsule (Risorine) worked about as well as standard TB treatment[1][2] | Piperine added as a booster; blood levels not given in the abstracts | More rifampicin in the blood from a lower dose, the authors report | RCT |
| Piperine blocked P-glycoprotein and CYP3A4[4] | A drug pump in the gut and a liver enzyme, tested in human cells and liver tissue | Could raise levels of drugs that depend on them, rifampicin among them | In vitro |
| Piperine more than doubled exposure to nevirapine, a different drug[3] | Not established | Shows the size of the effect piperine can have; not measured for rifampicin | Small clinical study |
No listing is not a clearance. A missing interaction here never means a combination is safe.
The evidence, study by study
Randomised trial in pulmonary TB, western India, 2017 RCT
216 people newly diagnosed with pulmonary TB were given either standard treatment or a regimen built around Risorine, a capsule of rifampicin 200 mg, isoniazid 300 mg and piperine 10 mg, for six months. Sputum cleared sooner in the Risorine group (93% against 84% at four weeks), and liver enzymes rose in 3 patients against 9. A quarter of the Risorine group did not finish, and the abstract gives no blood levels. The trial tested a whole product, not what piperine does to a standard rifampicin dose.[1]
Pilot study, Mumbai, 2016 Small clinical study
Thirty-three people with TB who had stomach trouble on standard tablets were switched to a Risorine regimen for six months. Of 27 whose sputum was positive at the start, 24 tested negative within two months. Two had mild nausea, and one patient with HIV developed hepatitis. There was no comparison group.[2]
Trial in healthy men, Hyderabad, 2007 Small clinical study
Eight healthy men took piperine 20 mg or a placebo each morning for six days, then a single dose of nevirapine, an HIV medicine, on day seven, and later swapped. With piperine, peak nevirapine level rose by about 120% and total exposure by about 170%. This is a different drug, but it shows how large piperine's effect on a medicine can be.[3]
Laboratory study, Germany, 2002 In vitro
In human gut cells and liver tissue, piperine blocked P-glycoprotein, a pump that pushes drugs back out of the gut, and CYP3A4, a major enzyme that breaks drugs down. The authors cite earlier data that piperine raises rifampicin levels in people. Lab findings like this show a possible route for an interaction. They do not show its size in people.[4]
What your doctor may watch for
- Liver tests and sputum results, which your TB doctor checks during treatment. Both Risorine studies tracked them.[1]
What to tell your prescribing doctor
You can read this out, or show them this page:
“I am on TB treatment with rifampicin. I am taking, or planning to take, a product with pippali, black pepper or piperine (name of product, dose). Piperine is known to raise rifampicin levels. Is this a problem with my regimen, and do my liver tests need checking?”
Withheld until review
Questions people ask
Risorine has piperine in it. Does that mean I can add pepper to my TB medicines?
No. Risorine has a fixed, measured amount of piperine and less rifampicin to allow for the boost, and it was tested as a whole regimen. Adding pippali or piperine to a standard rifampicin dose is a different thing, and we found no study of it.[1]
Is Risorine an approved medicine?
The Indian drug regulator lists rifampicin with isoniazid and piperine, and rifampicin with piperine, as approved on 11 December 2008 for adults with pulmonary TB. That listing does not say whether it is available now or used in the national TB programme.[5]
Will taking them a few hours apart prevent it?
No study we found tested timing. Ask your TB doctor rather than working out your own spacing.[1]
Related
Pippali, black pepper and phenytoin
Piperine, the compound in pippali and black pepper, raised phenytoin blood levels in two small Indian studies. Phenytoin has a narrow safe range.
InteractionPippali, black pepper and cyclosporine
Piperine from pepper raised cyclosporine absorption in rats and blocked its gut pump in lab cells. We found no study in people.
InteractionGarlic and isoniazid (TB medicine)
Not tested in people. In rabbits, two weeks of garlic extract cut isoniazid levels in the blood by more than half.
Sources
- Patel N, Jagannath K, Vora A, Patel M, Patel A. A randomized, controlled, phase III clinical trial to evaluate the efficacy and tolerability of Risorine with conventional rifampicin in the treatment of newly diagnosed pulmonary tuberculosis patients. J Assoc Physicians India. 2017;65(9):48-54. PMID 29313577.
- Vora A, Patel S, Patel K. Role of Risorine in the treatment of drug-susceptible pulmonary tuberculosis: a pilot study. J Assoc Physicians India. 2016;64(11):20-24. PMID 27805329.
- Kasibhatta R, Naidu MU. Influence of piperine on the pharmacokinetics of nevirapine under fasting conditions: a randomised, crossover, placebo-controlled study. Drugs R D. 2007;8(6):383-391. PMID 17963429.
- Bhardwaj RK, Glaeser H, Becquemont L, Klotz U, Gupta SK, Fromm MF. Piperine, a major constituent of black pepper, inhibits human P-glycoprotein and CYP3A4. J Pharmacol Exp Ther. 2002;302(2):645-650. PMID 12130727.
- Central Drugs Standard Control Organisation. Fixed dose combinations approved since 1961 to 12 July 2018, PDF page 59, entries 879-880.
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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