Herb & supplement monograph

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

But these pages have grown well beyond that into a full monograph — what Bitter Melon 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

Check Bitter Melon against your medication

Add one medication

✓ Supplement

Bitter Melon

1 Your medication

Start typing any prescription or over-the-counter drug name.

Reviewed by licensed pharmacists Sourced from Natural Medicines

On this page

Bitter Melon 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 Bitter Melon drug interaction appears low for most people. None of the listed interactions are rated major, and most rest on lab research rather than confirmed effects in people.

Interactions deserving the most attention

The interaction with the best human support involves diabetes medications. Bitter melon can lower blood glucose on its own, so combining it with these drugs may add up and raise the risk of low blood sugar, which makes close glucose monitoring sensible. There is also a single case report linking bitter melon juice to pancreatitis-like symptoms in a patient taking the cancer drug pazopanib, so caution is reasonable with that medication even though the evidence is limited.

What the rest of the list means

The long list of moderate interactions comes almost entirely from one theoretical concern: bitter melon may block a pump in the gut that helps move many medications, which could raise their levels. That idea is based mainly on lab research, and it has not been shown to cause meaningful changes in people. For most medications on the list, the risk remains unproven rather than established.

Check your medications against Bitter Melon

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

Interaction report

Drugs that interact with Bitter Melon

282 medications have a known interaction with Bitter Melon, 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 Bitter Melon using our pharmacist-reviewed interaction data.

AI summaries are generated from our Bitter Melon 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 Bitter Melon 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 Bitter Melon affects

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

All 3 drug categories Bitter Melon interacts with

Antidiabetes DrugsP-glycoprotein SubstratesPazopanib (votrient)

Antidiabetes Drugs

Taking bitter melon with antidiabetes drugs might increase the risk of hypoglycemia.
Bitter melon can lower blood glucose levels and might have additive effects when used with antidiabetes drugs. This might increase the risk of hypoglycemia in some patients. Monitor blood glucose levels closely.

Likelihood Probable Evidence B

P-Glycoprotein Substrates

Theoretically, bitter melon might increase levels of P-glycoprotein substrates.
Bitter melon might inhibit the p-glycoprotein (P-gp) intestinal pump and increase intracellular levels of P-gp substrates. In vitro research in intestinal cells shows that 1-monopalmitin, a constituent of bitter melon, increases levels of daunomycin, a P-gp substrate. Additionally, drinking bitter melon juice has been associated with a case of acute pancreatitis in a patient who had been taking pazopanib, a P-gp substrate, for 8 years. Researchers theorize that inhibition of P-gp led to increased levels of pazopanib, resulting in pazopanib-induced pancreatitis.

Likelihood Possible Evidence D

Pazopanib (Votrient)

Theoretically, bitter melon might increase levels of pazopanib, potentially increasing the risk of adverse effects.
In one case, a 65-year-old patient taking pazopanib for 8 years for renal cell carcinoma experienced signs and symptoms consistent with acute pancreatitis 4 days after drinking bitter melon juice at a dose of 100-150 mL daily. The patient's symptoms, amylase levels, and lipase levels improved upon discontinuation of bitter melon and pazopanib. Pazopanib treatment was re-initiated with no further evidence of pancreatitis. Researchers theorize that inhibition of P-glycoprotein by bitter melon led to increased levels of pazopanib, a P-glycoprotein substrate, resulting in pazopanib-induced pancreatitis.

Likelihood Possible Evidence D

Monograph

Bitter Melon: Uses, Safety & Side Effects

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

The bottom line

Bitter melon is a tropical fruit eaten as food and used in traditional medicine, most often for blood sugar control. While some small studies hint it may modestly lower blood sugar, the evidence is limited and inconsistent, so it should not replace proven diabetes treatment. Talk with your pharmacist or doctor before using it, especially if you take diabetes medicines or are pregnant.

Scientific name: Momordica charantia
Family: Cucurbitaceae
Part used: Fruit, seeds, leaves, and juice
Common forms: Fresh fruit, juice, capsules, dried powder, tea, extracts

People commonly use it for

Blood sugar support
Diabetes
Digestive complaints
Antioxidant source
Skin conditions

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

Safety at a glance

OverallUse caution

Generally tolerated as food, but supplement amounts may lower blood sugar and cause stomach upset.

PregnancyBest avoided

Traditionally avoided in pregnancy because seeds and high doses may cause uterine or other harmful effects.

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

Bitter melon (Momordica charantia) is a tropical and subtropical vine in the gourd family. Its fruit is long and green with a bumpy, warty surface and a very bitter taste. It grows in parts of Asia, Africa, the Caribbean, and South America.

It is widely eaten as a vegetable, especially in Indian, Chinese, and Southeast Asian cooking, where it is often called karela or ampalaya. Beyond food, it has a long history in traditional medicine systems for a range of conditions.

Today people take bitter melon as fresh fruit, juice, dried powder, tea, or capsules. The most common modern reason people use it is to help support healthy blood sugar levels.

How it works

Bitter melon contains several compounds that researchers believe may affect blood sugar. These include charantin, a substance called vicine, and a protein sometimes called polypeptide-p that has been compared to insulin in laboratory studies.

Proposed actions include helping cells take up glucose, affecting enzymes involved in sugar handling, and acting on insulin-related pathways. The fruit is also a source of antioxidants such as vitamin C and various plant compounds.

It is important to know that much of this mechanism research comes from test-tube and animal studies. How well these effects apply to people taking bitter melon is still uncertain.

Effectiveness

Does Bitter Melon work?

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

Evidence overview · 19 uses evaluated

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

Also studied for 19 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Amenorrhea