Herb & supplement monograph

Terminalia Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated June 2026

What is this page for?

First and foremost: how Terminalia interacts with medications. The heart of this page is the interaction list — every drug Terminalia is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Terminalia is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Terminalia Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Terminalia drug interaction appears low for most people, though the evidence is limited and mostly theoretical. None of the listed interactions are rated major, and every one is graded as only possible, based on lab or animal research rather than confirmed effects in people.

Interactions deserving the most attention

The concerns most worth watching involve medicines with a narrow margin for change. Lab studies suggest Terminalia arjuna may slow blood clotting, so combining it with anticoagulant or antiplatelet drugs could in theory raise bleeding risk. Animal research also shows Terminalia bellirica and chebula can lower blood sugar, which could add to the effect of diabetes medications. In animals, Terminalia chebula raised blood levels of chlorzoxazone and omeprazole, hinting it may slow how the body clears some drugs.

What the rest of the list means

The long list of interacting medications looks daunting, but most entries come from a single finding: in lab tests, Terminalia arjuna blocks enzymes the body uses to clear many common drugs. That predicted effect has not been confirmed in people, so most combinations are unlikely to cause a noticeable problem.

Check your medications against Terminalia

Based on HelloPharmacist’s Terminalia interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Terminalia

935 medications have a known interaction with Terminalia, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Terminalia using our pharmacist-reviewed interaction data.

AI summaries are generated from our Terminalia interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Terminalia combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Terminalia affects

Every type of medication (drug category) Terminalia is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 7 drug categories Terminalia interacts with

Anticoagulant/antiplatelet DrugsAntidiabetes DrugsChlorzoxazone (parafon Forte, Paraflex)Cytochrome P450 2c9 (cyp2c9) SubstratesCytochrome P450 2d6 (cyp2d6) SubstratesCytochrome P450 3a4 (cyp3a4) SubstratesOmeprazole (prilosec)

Anticoagulant/Antiplatelet Drugs

Theoretically, concomitant use of Terminalia arjuna with anticoagulant or antiplatelet drugs may increase the risk of bleeding in some patients.
In vitro, Terminalia arjuna bark extract inhibits platelet aggregation, decreases platelet activation, and shows antithrombotic properties.

Likelihood Possible Evidence D

Antidiabetes Drugs

Theoretically, concomitant use of Terminalia bellirica or Terminalia chebula with antidiabetes drugs could affect blood sugar control and increase the risk of hypoglycemia.
Animal and in vitro research shows that Terminalia bellirica and Terminalia chebula fruit and seed extract have hypoglycemic effects.

Likelihood Possible Evidence D

Chlorzoxazone (Parafon Forte, Paraflex)

Theoretically, use of Terminalia chebula may increase the risk of adverse effects from chlorzoxazone.
Animal research shows that enteral administration of Terminalia chebula for 15 days prior to administration of chlorzoxazone increases blood levels of chlorzoxazone and decreases chlorzoxazone clearance. It is speculated that Terminalia chebula reduces the metabolism of chlorzoxazone by inhibiting cytochrome P450 2E1.

Likelihood Possible Evidence D

Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, use of Terminalia arjuna may increase the levels and clinical effects of CYP2C9 substrates.
In vitro research shows that Terminalia arjuna extract inhibits CYP2C9 enzymes and reduces CYP2C9 substrate metabolism.

Likelihood Possible Evidence D

Cytochrome P450 2D6 (Cyp2D6) Substrates

Theoretically, use of Terminalia arjuna may increase the levels and clinical effects of CYP2D6 substrates.
In vitro research shows that Terminalia arjuna extract inhibits CYP2D6 enzymes and reduces CYP2D6 substrate metabolism.

Likelihood Possible Evidence D

Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, use of Terminalia arjuna may increase the levels and clinical effects of CYP3A4 substrates.
In vitro research shows that Terminalia arjuna extract inhibits CYP3A4 enzymes and reduces CYP3A4 substrate metabolism.

Likelihood Possible Evidence D

Omeprazole (Prilosec)

Theoretically, use of Terminalia chebula may increase the risk of adverse effects from omeprazole.
Animal research shows that enteral administration of Terminalia chebula for 15 days prior to administration of omeprazole increases blood levels of omeprazole and decreases omeprazole clearance. It is speculated that Terminalia chebula reduces the metabolism of omeprazole by inhibiting cytochrome P450 2C19.

Likelihood Possible Evidence D

Monograph

Terminalia: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed June 2026 ·

The bottom line

Terminalia is a group of traditional Ayurvedic tree species (most notably Terminalia arjuna) used for heart, digestive, and general wellness purposes. Some small studies suggest possible benefits for heart and cholesterol health, but the evidence is limited and not strong enough to recommend it as a treatment. Talk to your pharmacist or doctor before using it, especially if you have a heart condition.

Scientific name: Terminalia arjuna
Family: Combretaceae
Part used: Bark, fruit, and leaves (depending on species)
Common forms: Capsules, tablets, powder (churna), bark extract, decoction/tea

People commonly use it for

Heart health and circulation
Digestive problems (constipation, diarrhea)
Cholesterol support
Antioxidant and anti-inflammatory support
Immune support

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally well tolerated short-term in studies, but long-term safety and quality vary by product.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Jump to a section

Overview

Terminalia is a large genus of trees that grow in tropical and subtropical regions of the world, including India, Africa, and Southeast Asia. There are around 100 species, but three are most important in traditional medicine: Terminalia arjuna, Terminalia bellirica, and Terminalia chebula.

These trees have a long history in Ayurvedic medicine. Different parts of the plant are used, depending on the species. The bark of Terminalia arjuna is most often used for heart-related purposes, while the fruit of bellirica and chebula are used for digestive complaints. Terminalia bellirica and chebula are also two of the three fruits in the popular Ayurvedic blend known as triphala.

Today, Terminalia is sold as capsules, tablets, powders, and extracts. People take it hoping to support heart health, lower cholesterol, ease digestion, and provide antioxidant benefits.

How it works

Terminalia contains many natural plant compounds, including tannins, flavonoids, saponins, and other antioxidants. Researchers believe these compounds may help reduce oxidative stress and inflammation in the body.

For heart-related effects, some compounds in Terminalia arjuna are thought to help blood vessels relax, support the heart muscle, and act as a mild antioxidant. In digestive uses, the tannins and other compounds may affect the gut.

It is important to know that much of this information comes from laboratory and animal research. These early studies help explain what Terminalia might do, but they do not prove it works the same way in people.

Effectiveness

Does Terminalia work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 8 uses evaluated

8 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

For Terminalia, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 8 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Angina