Herb & supplement monograph

Gymnema Drug Interactions, Uses, Effectiveness, Safety & More

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

What is this page for?

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

But these pages have grown well beyond that into a full monograph — what Gymnema 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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Interaction report

Drugs that interact with Gymnema

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

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

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

2,830 drugs

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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 Gymnema 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 Gymnema affects

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

All 6 drug categories Gymnema interacts with

Antidiabetes DrugsCytochrome P450 1a2 (cyp1a2) SubstratesCytochrome P450 2c9 (cyp2c9) SubstratesPhenacetinTolbutamide (orinase)Cytochrome P450 3a4 (cyp3a4) Substrates

Antidiabetes Drugs

Theoretically, taking gymnema with antidiabetes drugs might increase the risk of hypoglycemia.
Gymnema reduces blood glucose levels in some human and animal research. In human studies, it has been shown to enhance the blood glucose lowering effects of hypoglycemic drugs. However, other research in adults with prediabetes or metabolic syndrome suggests that gymnema does not reduce fasting levels of blood glucose. Until more is known, monitor blood glucose levels closely.

Likelihood Probable Evidence B

Cytochrome P450 1A2 (Cyp1A2) Substrates

Theoretically, gymnema might increase levels of drugs metabolized by CYP1A2.
Animal and in vitro research shows that gymnema can inhibit the CYP1A2 enzyme. In one animal study, oral administration of gymnema for 7 days increased the plasma concentrations of phenacetin, a CYP1A2 substrate, by about 1.4-fold and reduced the clearance of phenacetin by about 29%.

Likelihood Possible Evidence D

Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, gymnema might increase or decrease levels of drugs metabolized by CYP2C9.
Animal research shows that gymnema can induce the CYP2C9 enzyme. In one animal study, gymnema caused a 2.4-fold increase in the clearance of tolbutamide, a CYP2C9 substrate, in rats. In vitro research also shows that gymnema can inhibit CYP2C9.

Likelihood Possible Evidence D

Phenacetin

Theoretically, taking gymnema with phenacetin might increase the levels of phenacetin.
Animal research shows that gymnema, administered orally for 7 days, decreases the clearance of phenacetin in a dose-dependent manner by about 21% to 29% and increases plasma levels about 1.3- to 1.4-fold when compared to control.

Likelihood Possible Evidence D

Tolbutamide (Orinase)

Theoretically, taking gymnema with tolbutamide might the decrease levels of tolbutamide.
Animal research shows that gymnema, administered orally for 7 days, increases the clearance of tolbutamide by 2.4-fold when compared to control.

Likelihood Possible Evidence D

Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, gymnema might increase levels of drugs metabolized by CYP3A4.
One in vitro study using rat liver microsomes shows that gymnema can modestly inhibit the CYP3A4 enzyme. However, other in vitro research using human liver microsomes shows that gymnema does not affect CYP3A4 activity. Animal research also shows that gymnema does not alter the function of CYP3A4. In one study in rats, oral administration of gymnema for 7 days did not alter the clearance of amlodipine, a CYP3A4 substrate.

Likelihood Unlikely Evidence D

Monograph

Gymnema: Uses, Safety & Side Effects

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

The bottom line

Gymnema is an Ayurvedic herb best known for possibly helping lower blood sugar and reducing the taste of sweetness on the tongue. Some early human studies are encouraging for blood sugar support, but the evidence is still limited and not strong enough to replace standard treatment. If you have diabetes or take other medicines, talk with your pharmacist or doctor before using it.

Scientific name: Gymnema sylvestre
Family: Apocynaceae
Part used: Leaves (and sometimes the root)
Common forms: Capsules, tablets, powders, liquid extracts, teas, and chewable lozenges

People commonly use it for

Blood sugar support
Type 2 diabetes
Sugar cravings
Weight management
Cholesterol 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, but it can lower blood sugar and quality varies between products.

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.

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Overview

Gymnema (Gymnema sylvestre) is a woody climbing plant native to the tropical forests of India, Africa, and parts of Asia. Its leaves have been used in Ayurvedic medicine for hundreds of years.

In Hindi the plant is often called gurmar, which means "sugar destroyer." This name comes from a unique effect: chewing the leaf can temporarily dull your ability to taste sweetness. Because of this, the herb has long been linked with managing sugar intake and supporting blood sugar.

Today gymnema is sold as a dietary supplement, usually as a leaf extract in capsules, tablets, powders, teas, or chewable forms. Many products are standardized to a group of active compounds called gymnemic acids.

How it works

Gymnema leaves contain compounds called gymnemic acids, which are believed to be responsible for most of its effects.

On the tongue, these compounds can temporarily block sweet taste receptors, which is why sweet foods taste less sweet after chewing the leaf. The theory is that this may help reduce the desire to eat sugary foods.

In the gut, gymnemic acids are thought to slow the absorption of sugar from the intestine. Laboratory and animal studies also suggest gymnema may help the pancreas release insulin or support insulin-producing cells. Most of these mechanisms come from test-tube and animal research, so we cannot be sure how strongly they apply to people.

Effectiveness

Does Gymnema work?

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

Evidence overview · 4 uses evaluated

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

Also studied for 4 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Diabetes

Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral gymnema is beneficial for diabetes.

Insufficient Reliable Evidence To Rate Impaired glucose tolerance (prediabetes)

Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral gymnema is beneficial for impaired glucose tolerance.

Insufficient Reliable Evidence To Rate Metabolic syndrome

Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral gymnema is beneficial for metabolic syndrome.

Insufficient Reliable Evidence To Rate Obesity

Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral gymnema improves weight loss in overweight or obese adults.

Source & disclaimer. Effectiveness ratings and evidence summaries are provided by Natural Medicines (Therapeutic Research Center) and shown as licensed. Where Natural Medicines hasn’t rated a use, HelloPharmacist’s pharmacists may add their own reviewed rating and evidence (each such entry is labeled). This is educational information, not medical advice — talk with your pharmacist or doctor before starting, stopping, or changing a supplement.

Safety & precautions

Gymnema appears to be reasonably well tolerated when used short-term in typical supplement amounts. However, long-term safety has not been well studied.

Because gymnema can lower blood sugar, people with diabetes or those taking blood-sugar-lowering medicines should use it carefully and monitor for signs of low blood sugar, such as shakiness, sweating, or dizziness. People scheduled for surgery may be advised to stop it beforehand because of its effect on blood sugar.

Supplement quality can vary a lot between brands, so choose products from reputable manufacturers, ideally with third-party testing.

There is not enough reliable safety information for pregnancy or breastfeeding, so gymnema is best avoided during these times. Children should not use it unless directed by a healthcare provider. Always check with your pharmacist or doctor before starting gymnema.

Side effects

Gymnema is usually well tolerated, but some people may experience side effects, including:

Low blood sugar (hypoglycemia), especially if combined with diabetes medicines
Stomach upset, nausea, or gas
Headache or lightheadedness
A temporary loss of the ability to taste sweetness

Serious side effects appear to be uncommon, but allergic reactions are always possible with any plant product. Stop taking it and seek medical care if you have signs of an allergic reaction such as rash, swelling, or trouble breathing.

Gymnema: Reported Adverse Effects

Documented safety reports on Gymnema from the evidence-graded Natural Medicines (TRC Healthcare) database, shown word-for-word from the licensed record.

Reports by condition

Anemia Hepatic

A case of drug-induced hepatitis characterized by weakness, fatigue, jaundice, and elevated liver enzymes, has been reported for a patient who consumed gymnema tea three times daily for 10 days. The patient was administered prednisone 60 mg once daily and was eventually tapered off prednisone and discharged. Laboratory values normalized after 6 months. A case of hepatitis-associated aplastic anemia characterized by jaundice, elevated liver function tests, and pancytopenia has been reported for a patient who consumed gymnema 2 grams twice daily for at least a month. Treatment with ursodeoxycholic acid for 8 weeks led to resolution of cholestatic hepatitis; however, the pancytopenia was not responsive to treatment with immunosuppressive drugs and the patient died 5 months after presentation. The exact reason for these adverse effects is not clear; they may have been idiosyncratic.

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.

Adverse-effects data: Natural Medicines, Therapeutic Research Center

Dosing

There is no official or universally agreed-upon dose for gymnema. The right amount depends on the product, the type of extract, and how it is standardized.

Many supplements are standardized to gymnemic acid content, and doses in studies have varied widely. Because of this, the safest approach is to follow the directions on the product label and not exceed them.

If you are considering gymnema for blood sugar support, talk with your pharmacist or doctor first. They can help you choose a reputable product, decide on an appropriate amount, and make sure it is safe with your current health conditions and medicines.

Pregnancy & Breastfeeding

Gymnema & Pregnancy

Insufficient reliable information

Insufficient reliable information available; avoid using.

Gymnema & Breastfeeding

Insufficient reliable information

Insufficient reliable information available; avoid using.

Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center

References & further reading

The 12 references that drive our Gymnema 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.

Shanmugasundaram ER, Rajeswari G, Baskaran K, et al. Use of Gymnema sylvestre leaf extract in the control of blood glucose in insulin-dependent diabetes mellitus. J Ethnopharmacol 1990;30:281-94. PubMed
Baskaran K, Kizar Ahamath B, Radha Shanmugasundaram K, Shanmugasundaram ER. Antidiabetic effect of leaf extract from Gymnema sylvestre in non-insulin-dependent diabetes mellitus patients. J Ethnopharmacol 1990;30:295-300.
Kamble B, Gupta A, Moothedath I, Khatal L, Janrao S, Jadhav A, et al. Effects of Gymnema sylvestre extract on the pharmacokinetics and pharmacodynamics of glimepiride in streptozotocin induced diabetic rats. Chem Biol Interact. 2016;245:30-8. PubMed
Tiwari P, Mishra BN, Sangwan NS. Phytochemical and pharmacological properties of Gymnema sylvestre: an important medicinal plant. Biomed Res Int. 2014; 2014:830285.
Fabio GD, Romanucci V, De Marco A, Zarrelli A. Triterpenoids from Gymnema sylvestre and their pharmacological activities. Molecules. 2014;19(8):10956-81. PubMed
Shiyovich A, Sztarkier I, Nesher L. Toxic hepatitis induced by Gymnema sylvestre, a natural remedy for type 2 diabetes mellitus. Am J Med Sci. 2010;340(6):514-7. PubMed
Zuniga LY, Gonzalez-Ortiz M, Martinez-Abundis E. Effect of gymnema sylvestre administration on metabolic syndrome, insulin sensitivity, and insulin secretion. J Med Food. 2017 Aug;20(8):750-54.
Rammohan B, Samit K, Chinmoy D, et al. Human cytochrome P450 enzyme modulation by gymnema sylvestre: a predictive safety evaluation by LC-MS/MS. Pharmacogn Mag. 2016 Jul;12(Suppl 4):S389-S394.
Vaghela M, Sahu N, Kharkar P, Pandita N. In vivo pharmacokinetic interaction by ethanolic extract of gymnema sylvestre with CYP2C9 (tolbutamide), CYP3A4 (amlodipine) and CYP1A2 (phenacetin) in rats. Chem Biol Interact. 2017 Dec 25;278:141-151. PubMed
Vaghela M, Iyer K, Pandita N. In vitro inhibitory effect of gymnema sylvestre extracts and total gymnemic acids fraction on select cytochrome P450 activities in rat liver microsomes. Eur J Drug Metab Pharmacokinet. 2017 Oct 10. PubMed
Gaytán Martínez LA, Sánchez-Ruiz LA, Zuñiga LY, González-Ortiz M, Martínez-Abundis E. Effect of Gymnema sylvestre administration on glycemic control, insulin secretion, and insulin sensitivity in patients with impaired glucose tolerance. J Med Food. 2021;
Philips CA, Theruvath AH, Ravindran R. Toxic hepatitis-associated aplastic anaemia after dual homeopathic remedies and Gymnema sylvestre use. BMJ Case Rep 2022;15(3):e247867. PubMed

Keep reading

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.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

Brand directory

Brands that make products with Gymnema

417 brands in our database make a supplement containing Gymnema.

ANTIAGING Institute of California 25 products AOR Advanced Orthomolecular Research Advanced 60 products AOR Advanced Orthomolecular Research Premium 45 products AOR Advanced Orthomolecular Research Ultra 8 products Apax USA 3 products APOPTOSIS Nutraceuticals 18 products Applied Nutriceuticals 30 products Approved Science 116 products Arazo Nutrition 61 products Axe & Sledge Supplements 109 products Ayur Earth 21 products Ayurvedic Rasayanas 42 products Ayush Herbs 37 products Banyan Botanicals 697 products Barlowe's Herbal Elixirs 16 products Beneve 3 products BenfoComplete.com 4 products Best Naturals 363 products Beverly International 42 products Beyond Health 35 products Beyond Human 8 products BioChem 101 products BioChem Sports 30 products BioGenesis Nutraceuticals 87 products

Product directory

Supplement products with Gymnema

1,091 products in our database contain Gymnema. Open any to see its full ingredient list and every drug interaction we check.

Pharmacist Counseling Corner

Gymnema: Common Questions

What is Gymnema used for, and does it work?

People use Gymnema for a range of reasons, but according to the Natural Medicines database the current clinical evidence is insufficient to confirm it works for the specific conditions it has been studied for. See the graded list on this page, and talk to your pharmacist or doctor before relying on it for any condition.

Does Gymnema interact with prescription medications?

Yes. We list 853 medications with a known interaction with Gymnema. Use the checker above to see how Gymnema interacts with a specific drug.

How are Gymnema interactions rated?

Each interaction is graded major, moderate, or minor based on how clinically significant it is and the strength of the evidence behind it. Major interactions are the most serious and are best avoided, or used only under close professional supervision.

Is it safe to take Gymnema with my medications?

It depends on the specific medication. Some combinations are fine, while others call for monitoring, timing changes, or should be avoided. Check your exact drug above and confirm with your pharmacist or doctor before starting, stopping, or changing anything.

Where does this Gymnema interaction information come from?

Our interaction data is built on the Natural Medicines database — an evidence-graded reference for vitamins, herbs, and supplements — and is reviewed by licensed HelloPharmacist pharmacists, who may add clinical context.

What is Gymnema used for?

It is most commonly used to support healthy blood sugar, reduce sugar cravings, and help with weight management. Evidence is strongest (though still limited) for blood sugar support in type 2 diabetes.

Does Gymnema really stop you from tasting sugar?

Yes, chewing the leaf or using certain lozenges can temporarily make sweet foods taste much less sweet. This effect is real but lasts only a short time.

Is Gymnema safe to take?

It is generally well tolerated short-term in healthy adults, but it can lower blood sugar and long-term safety isn't well known. Pregnant or breastfeeding people, and anyone with diabetes, should check with a doctor or pharmacist first.

Can Gymnema replace my diabetes medication?

No. Gymnema should not be used in place of prescribed diabetes medicine or lifestyle changes. Talk to your healthcare provider before making any changes to your treatment.

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

Keep exploring

Products that contain Gymnema

A rotating sample of real supplements in our database that list Gymnema — open any to see its full ingredients and every drug interaction we check.

See all 1,091 products with Gymnema →

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Gymnema Drug Interactions, Uses, Effectiveness, Safety & More

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Drugs that interact with Gymnema

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What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Likelihood — How Well It’s Documented

Where This Data Comes From

The kinds of drugs Gymnema affects

Gymnema: Uses, Safety & Side Effects

Overview

How it works

Does Gymnema work?

Safety & precautions

Side effects

Gymnema: Reported Adverse Effects

Dosing

Gymnema & Pregnancy

Gymnema & Breastfeeding

References & further reading

Brands that make products with Gymnema

Supplement products with Gymnema

Gymnema: Common Questions

Related supplements & herbs

Products that contain Gymnema

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