Drug & supplement interaction

Terminalia Chebula + Methylnaltrexone

Methylnaltrexone brand name: Relistor.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Terminalia Chebula and Methylnaltrexone in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the label for Methylnaltrexone states a food rule worth keeping to.

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Interaction report

Terminalia Chebula and Methylnaltrexone

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Methylnaltrexone and Terminalia Chebula in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Terminalia Chebula safety at a glance

Terminalia Chebula overall Use caution Generally used in traditional medicine, but human safety data are limited and quality of products varies.
Pregnancy Possibly Unsafe When used orally. One source warns against using Terminalia bellirica and Terminalia chebula during pregnancy; however, the reason for this warning is not descr... Read the full pregnancy detail
Breastfeeding Avoid Safety during breastfeeding is unknown, so it is best avoided.

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Methylnaltrexone and Terminalia Chebula? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Methylnaltrexone

Interactions in our licensed database are recorded against drug classes, not just single drug names. Methylnaltrexone is filed under a single classification — cytochrome p450 2d6 (cyp2d6) inhibitors. Terminalia Chebula has documented interactions with 3 drug classes — the most serious being antidiabetes drugs (moderate), chlorzoxazone (parafon forte, paraflex) (moderate) and omeprazole (prilosec) (moderate) — and none of Methylnaltrexone’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Terminalia Chebula Does Interact With Other Medications

Terminalia Chebula has 93 moderate known drug interactions in our database — Methylnaltrexone isn’t one of them. If you take anything else, check it against the full list below.

Moderate 93 No known interaction 2,737 (incl. Methylnaltrexone)
Taking anything else?

Check Another of Your Medications Against Terminalia Chebula

Covers the 2,830 medications we’ve checked against Terminalia Chebula. Pick one to open its full report.

What to actually watch for

What Terminalia Chebula Itself Has Been Linked To

This is not an interaction — nothing below involves Methylnaltrexone. It is the side-effect record for Terminalia Chebula on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Terminalia Chebula, this list is the first place to look. One entry is worth acting on rather than waiting out — marked below.

  • An allergic reaction Worth acting on Additional detail

    “In a small clinical study, two adults with hyperlipidemia developed a hypersensitivity rash, one with facial edema, within minutes of oral administration of Triphala (containing an aqueous extract of Terminalia chebula, Terminalia bellirica, and Indian gooseberry), together with guggul extract. It is unclear if this reaction was due to Triphala, guggul, or other factors.”

    Terminalia Chebula · Natural Medicines adverse-effect record, reported in hypercholesterolemia.

    1 source cited
    1. 105741. Donato F, Raffetti E, Toninelli G, Festa A, Scarcella C, Castellano M; TRIGU Project Working Group. Guggulu and Triphala for the Treatment of Hypercholesterolaemia: A Placebo-Controlled, Double-Blind, Randomised Trial. Complement Med Res 2021;28(3):216-22 PubMed
  • Swelling / A skin rash Additional detail

    Recorded for Terminalia Chebula in the same Natural Medicines adverse-effect record shown under An allergic reaction above.

Everything above comes from the Natural Medicines adverse-effect record for Terminalia Chebula — expand a row for the licensed statement it rests on. We read the ADVERSE REACTIONS section of Methylnaltrexone’s FDA label too, and the two lists don’t meaningfully overlap — which is why no Methylnaltrexone column appears here.

Special populations

Terminalia Chebula in Pregnancy & Breastfeeding

Pregnancy Possibly Unsafe

When used orally. One source warns against using Terminalia bellirica and Terminalia chebula during pregnancy; however, the reason for this warning is not described. Until more is known, avoid use.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

How to take them

Some Methylnaltrexone Products Have a Food Rule — Terminalia Chebula Should Not Break It

At least one FDA label for a product containing Methylnaltrexone says to take it on an empty stomach. Most supplements — Terminalia Chebula included — are taken with a meal, so the easy mistake is swallowing both together at breakfast. Where that rule applies, keep Methylnaltrexone on its own and move Terminalia Chebula to a meal later in the day.

This may not be true of your version. Food instructions belong to the product, not the ingredient: two Methylnaltrexone products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.

o In patients with chronic non-cancer pain and OIC, take RELISTOR tablets with water on an empty stomach at least 30 minutes before the first meal of the day.

From the Dosage and Administration section of the FDA label we read for Methylnaltrexone — where that label names a specific product, the instruction is that product's. See the Methylnaltrexone drug page ›

A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.

Overlapping uses

What Methylnaltrexone Is Prescribed For, and What Terminalia Chebula Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Methylnaltrexone is a prescription medicine with approved uses on its FDA label. Terminalia Chebula is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Methylnaltrexone is prescribed for: Methylnaltrexone, sold as Relistor, treats opioid-induced constipation (OIC) — constipation caused by opioid pain medications. Both Relistor tablets and Relistor injection are approved for adults with chronic non-cancer pain, including those with pain related to a prior cancer or its treatment who do not need frequent opioid dose increases. Relistor injection is also approved for adults with advanced illness or active cancer pain who require increasing opioid doses as part of palliative care.

Terminalia Chebula has been studied for:

  • Constipation studied, not established Terminalia Chebula has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Terminalia Chebula for constipation

    Although there has been interest in using oral Terminalia chebula for constipation, there is insufficient reliable information about the clinical effects of Terminalia chebula for this purpose.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Methylnaltrexone on your own; if you are taking Terminalia Chebula for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Methylnaltrexone

This page covers Terminalia Chebula only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Methylnaltrexone page lists 3 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Fever Bark (moderate), Iboga (moderate) and Yohimbe (moderate).

By severity: 3 moderate.

From our pharmacist’s overview on the Methylnaltrexone page

“If you take methylnaltrexone (Relistor) for opioid-induced constipation, the supplement list to know is short: three ingredients, all rated moderate, none major. Yohimbe, fever bark, and iboga are all cleared by the same liver enzyme, CYP2D6, and methylnaltrexone can slow that enzyme, letting their active compounds build up in your blood.”

Reviewed by 2 · Jul 18, 2026

Open the Methylnaltrexone interaction page

How much people look this up

Where Terminalia Chebula and Methylnaltrexone Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Terminalia Chebula
Steady interest

#1,347 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Methylnaltrexone
Steady interest

#2,469 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Terminalia Chebula reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Terminalia Chebula and Methylnaltrexone records this page draws on were last updated July 11, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Terminalia Chebula

What is Terminalia Chebula?

  • Digestive support and constipation
  • Antioxidant support
  • Oral and throat health
  • General immune support
  • Traditional tonic in Ayurvedic medicine

Terminalia chebula, often called haritaki, is a fruit widely used in Ayurvedic medicine, most commonly for digestion and as a key part of the Triphala blend. Early laboratory and small human studies suggest possible antioxidant and digestive effects, but high-quality evidence in people is limited. Talk with your pharmacist or doctor before using it, especially if you are pregnant, breastfeeding, or take other medicines.

Terminalia chebula · Combretaceae · Dried fruit · Powder (churna), capsules, tablets, decoctions, and as part of herbal blends like Triphala

An interaction check asks whether these two react with each other — it does not ask whether Terminalia Chebula is a good idea for someone in your situation. Here is what our Terminalia Chebula record says about it on its own.

Terminalia Chebula: dosing

There is no official, standardized dose of Terminalia chebula. Traditional and commercial products vary widely in their strength and form.The safest approach is to follow the directions on the product label and not exceed the recommended amount.

From our Terminalia Chebula monograph — the full record covers uses, side effects and every documented interaction.

Read the full Terminalia Chebula monograph & all interactions
Medication

About Methylnaltrexone

What Is Methylnaltrexone Used For?

Brand name: Relistor

Methylnaltrexone, sold as Relistor, treats opioid-induced constipation (OIC) — constipation caused by opioid pain medications. Both Relistor tablets and Relistor injection are approved for adults with chronic non-cancer pain, including those with pain related to a prior cancer or its treatment who do not need frequent opioid dose increases.

Relistor injection is also approved for adults with advanced illness or active cancer pain who require increasing opioid doses as part of palliative care.

See full Methylnaltrexone drug information
Keep checking

Other Drugs & Terminalia Chebula

Browse every other medication we’ve checked against Terminalia Chebula — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
93Moderate
0Minor
2,736No known interaction
93 Moderate 2,736 No interaction
Moderate

93 interactions

Showing 60 of 93 moderate interactions — see all 93 on the Terminalia Chebula page.

No interaction 2,736 drugs checked — show the list

We also checked Terminalia Chebula against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,736 medications checked with no known interaction — see the full Terminalia Chebula list.

See the full Terminalia Chebula interactions page
See every supplement checked against Methylnaltrexone, ranked by severity
Evidence & sources

Terminalia Chebula References

The 9 references that drive our Terminalia Chebula monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Chevallier A. Encyclopedia of Medicinal Plants. New York, NY: DK Publishing, 1996.
  2. Sabu, M. C. and Kuttan, R. Anti-diabetic activity of medicinal plants and its relationship with their antioxidant property. J Ethnopharmacol. 2002;81(2):155-160. PubMed
  3. Murali, Y. K., Anand, P., Tandon, V., Singh, R., Chandra, R., and Murthy, P. S. Long-term effects of Terminalia chebula Retz. on hyperglycemia and associated hyperlipidemia, tissue glycogen content and in vitro release of insulin in streptozotocin induced
  4. Senthilkumar, G. P. and Subramanian, S. Evaluation of antioxidant potential of Terminalia chebula fruits studies in streptozotocin-induced diabetic rats. Pharmaceutical Biology (Netherlands) 2007;45:511-518.
  5. Wu G, Dong Z, Dong J, et al. Effects of mongolian medicine Terminalia chebula Retz. on 6 CYP450 enzymes in rats. Int J Clin Exp Pathol 2020;13(12):3128-3138.
  6. Donato F, Raffetti E, Toninelli G, Festa A, Scarcella C, Castellano M; TRIGU Project Working Group. Guggulu and Triphala for the Treatment of Hypercholesterolaemia: A Placebo-Controlled, Double-Blind, Randomised Trial. Complement Med Res 2021;28(3):216-22 PubMed
  7. Das A, Naveen J, Sreerama YN, Gnanesh Kumar BS, Baskaran V. Low-glycemic foods with wheat, barley and herbs (Terminalia chebula, Terminalia bellerica and Emblica officinalis) inhibit a-amylase, a-glucosidase and DPP-IV activity in high fat and low dose st
  8. Eltimamy M, Elshamarka M, Aboelsaad M, Sayed M, Moawad H. Effects of alcoholic extract of Terminalia Chebula dried fruit on blood biochemical profile in diabetic rats. J Diabetes Metab Disord 2022;21(1):159-170. PubMed
  9. Agrawal OD, Kulkarni YA. Treatment with Terminalia chebula extract reduces insulin resistance, hyperglycemia and improves SIRT1 expression in type 2 diabetic rats. Life (Basel) 2023;13(5):1168. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Terminalia Chebula and Methylnaltrexone Together: Common Questions

Is it safe to take Terminalia Chebula with Methylnaltrexone?
We do not list a known interaction between Terminalia Chebula and Methylnaltrexone. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Should I take Terminalia Chebula and Methylnaltrexone at the same time of day?
At least one FDA label for a product containing Methylnaltrexone says to take it on an empty stomach, and supplements are usually taken with a meal — so taking them together at breakfast is the easy mistake. Where that applies, keep Methylnaltrexone on its own and move Terminalia Chebula to a meal later in the day. Food instructions belong to the product rather than the ingredient, so check the directions on your own box. This is about absorption, not an interaction.
Are Terminalia Chebula and Methylnaltrexone used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Terminalia Chebula in each. That is a conversation for your prescriber, especially if Methylnaltrexone is being adjusted to a target.
How was the Terminalia Chebula and Methylnaltrexone combination checked?
Interactions in our licensed database are recorded against drug classes. Methylnaltrexone is filed under 1 classification, and Terminalia Chebula has documented interactions with 3 drug classes — none of Methylnaltrexone's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Terminalia Chebula interact with any other medications?
Yes. Terminalia Chebula has 93 documented drug interactions in our database — Methylnaltrexone is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Methylnaltrexone interact with any supplements?
Yes. Methylnaltrexone has documented interactions with 3 supplements in our database — Terminalia Chebula is not one of them. The Methylnaltrexone interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

Terminalia Chebula monograph Uses, safety profile, and every drug interaction in one place Methylnaltrexone drug information The full plain-English guide to this medication Methylnaltrexone supplement interactions Every supplement checked against Methylnaltrexone, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 9 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Methylnaltrexone and Terminalia Chebula?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.