Herb & supplement monograph

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

But these pages have grown well beyond that into a full monograph — what Colocynth 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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Colocynth 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 Colocynth drug interaction appears low for most people, though a few medicine types deserve some care. None of the listed interactions are rated major, and nearly all rest on theoretical concerns rather than documented problems in people.

Interactions deserving the most attention

The best-supported concern involves diabetes medications: small human studies found colocynth fruit powder lowered fasting blood sugar in people already taking these drugs, so combining them could push blood sugar too low. Beyond that, colocynth is thought to act as a laxative, and in theory the resulting fluid and potassium loss could matter with warfarin and digoxin, two medicines with narrow safety margins where extra bleeding risk or low potassium can cause real trouble. The same reasoning applies to potassium-depleting diuretics and stimulant laxatives.

What the rest of the list means

The long list of interacting medications largely reflects one shared idea, colocynth's possible laxative effect and the fluid and electrolyte shifts it could cause, applied across many drugs. Most of these pairings are theoretical and have not been shown to cause meaningful problems in people, so a medication appearing on the list does not mean the combination is known to be harmful.

Check your medications against Colocynth

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

Interaction report

Drugs that interact with Colocynth

185 medications have a known interaction with Colocynth, 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 Colocynth using our pharmacist-reviewed interaction data.

AI summaries are generated from our Colocynth 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 Colocynth 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 Colocynth affects

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

All 5 drug categories Colocynth interacts with

Antidiabetes DrugsDigoxin (lanoxin)Diuretic DrugsStimulant LaxativesWarfarin (coumadin)

Antidiabetes Drugs

Theoretically, colocynth might increase the risk of hypoglycemia when taken with antidiabetes drugs.
Small clinical studies show that colocynth fruit powder reduces fasting blood glucose levels in patients with type 2 diabetes who are also taking antidiabetes drugs.

Likelihood Possible Evidence B

Digoxin (Lanoxin)

Theoretically, by depleting potassium, colocynth might increase the risk of digoxin-related adverse effects.
Colocynth is thought to have laxative effects, which might cause potassium depletion.

Likelihood Possible Evidence D

Diuretic Drugs

Theoretically, colocynth might increase the risk of hypokalemia when taken with potassium-depleting diuretic drugs.
Colocynth is thought to have laxative effects, which might cause potassium depletion.

Likelihood Possible Evidence D

Stimulant Laxatives

Theoretically, colocynth might increase the risk for fluid and electrolyte loss when taken with stimulant laxatives.
Colocynth is thought to have laxative effects. Concomitant use with stimulant laxatives might compound fluid and electrolyte loss.

Likelihood Possible Evidence D

Warfarin (Coumadin)

Theoretically, colocynth might increase the risk of bleeding when taken with warfarin.
Colocynth is thought to have laxative effects. In some people colocynth can cause diarrhea. Diarrhea can increase the effects and adverse effects of warfarin.

Likelihood Possible Evidence D

Monograph

Colocynth: Uses, Safety & Side Effects

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

The bottom line

Colocynth is a bitter desert gourd used in traditional medicine mainly as a powerful laxative, but it is highly toxic and can cause severe, sometimes deadly poisoning even at small doses. There is not enough good human evidence to support its use, and most pharmacists would advise against taking it. If you are curious about it, talk to a doctor or pharmacist before using any product that contains it.

Scientific name: Citrullus colocynthis
Family: Cucurbitaceae
Part used: Fruit (pulp), seeds, and root
Common forms: Dried fruit pulp, powder, capsules, traditional and homeopathic preparations

People commonly use it for

Constipation
Digestive complaints
Diabetes (traditional use)
Joint and nerve pain
Skin conditions

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

Safety at a glance

OverallBest avoided

Colocynth is a strong irritant and poison that can cause severe gut damage and death.

PregnancyBest avoided

It may stimulate the uterus and is considered unsafe in pregnancy.

BreastfeedingUnsafe

When used orally due to severe gastrointestinal toxicity; 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

Colocynth (Citrullus colocynthis) is a vine in the gourd and melon family. It produces a small, round, bitter fruit that is sometimes called bitter apple, bitter cucumber, or desert gourd. The plant grows in dry, sandy regions of North Africa, the Middle East, the Mediterranean area, and parts of Asia.

The dried fruit pulp has been used for centuries in traditional and folk medicine, mostly as a strong laxative or "purgative." It also appears in some homeopathic remedies for cramping pain. Because the plant is extremely bitter and irritating, it has never become a mainstream herbal product.

How it works

Colocynth contains bitter compounds called cucurbitacins, along with substances sometimes grouped under the name "colocynthin." These compounds are strong irritants to the lining of the stomach and intestines. When swallowed, they can trigger powerful, watery bowel movements, which is why the plant was used as a harsh laxative.

Researchers have also studied whether extracts of the plant might affect blood sugar, inflammation, or the growth of bacteria. Much of this work comes from test-tube or animal studies. These mechanisms are not well proven in humans, and the same compounds that may show activity in the lab are also responsible for the plant's toxicity.

Effectiveness

Does Colocynth work?

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

Evidence overview · 6 uses evaluated

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

Also studied for 6 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Chemotherapy-induced peripheral neuropathy