Drug & supplement interaction

Gossypol + Furosemide

Furosemide brand name: Lasix.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

Gossypol has a moderate interaction with Furosemide. Theoretically, gossypol might increase the risk of hypokalemia when taken with potassium-depleting diuretic drugs.

Read the full interaction report
SeverityModerate
LikelihoodPossible
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Gossypol and Furosemide

Here is the interaction we found between these two, with the evidence behind it.

Moderate

DIURETIC DRUGS

Why this applies to Furosemide

Furosemide falls under DIURETIC DRUGS — the group Gossypol interacts with.

Theoretically, gossypol might increase the risk of hypokalemia when taken with potassium-depleting diuretic drugs.
Clinical research shows that gossypol has potassium-depleting effects and can cause hypokalemia. Initiation of potassium supplementation or an increase in potassium supplement dose may be necessary for some patients.
Severity Moderate Likelihood Possible Evidence D

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.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the concern with these two together. Furosemide (Lasix) is a powerful water pill that pushes your kidneys to flush out extra fluid and salt, and one well-known side effect is that it also drags potassium out with it. Gossypol, on its own, has also been shown to lower potassium. So stacking them could leave your potassium running too low, which can show up as muscle cramps, weakness, fatigue, or an irregular heartbeat.

I'll be honest: this particular pairing is based on how both substances behave (theoretical pharmacology) rather than strong human studies. Gossypol also isn't a safe, approved supplement and carries serious risks of its own. Please don't start or stop anything on your own. Talk with your pharmacist or doctor, who may want to check your potassium level.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Woolley, R. J. Contraception--a look forward, Part II: Mifepristone and gossypol. J.Am.Board Fam.Pract. 1991;4(2):103-113.
  2. Bushunow, P., Reidenberg, M. M., Wasenko, J., Winfield, J., Lorenzo, B., Lemke, S., Himpler, B., Corona, R., and Coyle, T. Gossypol treatment of recurrent adult malignant gliomas. J.Neurooncol. 1999;43(1):79-86. PubMed
  3. Reidenberg, M. M. Environmental inhibition of 11beta-hydroxysteroid dehydrogenase. Toxicology 4-3-2000;144(1-3):107-111.
  4. Song, D., Lorenzo, B., and Reidenberg, M. M. Inhibition of 11 beta-hydroxysteroid dehydrogenase by gossypol and bioflavonoids. J.Lab Clin.Med. 1992;120(5):792-797.
  5. Fu, Y. F., Zhang, S. L., Lu, Z. M., and Wang, W. Effects of gossypol on the activity of kidney (Na+ + K+)-ATPase and the functions of erythrocyte membrane. Contraception 1988;37(2):179-184. PubMed
  6. Fu, Y. F., Zhang, S. L., Lu, Z. M., and Wang, W. Effects of gossypol on the activity of rabbit kidney Na,K-ATPase and the functions of human erythrocyte membrane. Prog.Clin.Biol.Res. 1988;268B:385-392.
  7. Kjaergaard, N. [Male contraception]. Ugeskr.Laeger 9-8-1986;148(37):2335-2338.
  8. Bi, X. F., Ye, Y. X., Yang, H. F., and Zhang, Z. R. [Preliminary study on gossypol in causing hypokalemia (author's transl)]. Zhongguo Yi.Xue.Ke.Xue.Yuan Xue.Bao. 1981;3(3):175-178.
  9. Aitken, R. J., Liu, J., Best, F. S., and Richardson, D. W. An analysis of the direct effects of gossypol on human spermatozoa. Int.J.Androl 1983;6(2):157-167. PubMed
  10. Waites, G. M. Male fertility regulation: the challenges for the year 2000. Br.Med Bull. 1993;49(1):210-221. PubMed
  11. Reidenberg, M. M., Gu, Z. P., Lorenzo, B., Coutinho, E., Athayde, C., Frick, J., Alvarez, F., Brache, V., and Emuveyan, E. E. Differences in serum potassium concentrations in normal men in different geographic locations. Clin.Chem. 1993;39(1):72-75. DOI

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction 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.
  • PossibleInteraction 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.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Gossypol Also Interacts With Other Medications

Gossypol has 103 moderate known drug interactions in our database — the Furosemide one above is one of them. If you take anything else, check it against the full list below.

Moderate 103 No known interaction 2,727 (incl. Furosemide)
Taking anything else?

Check Another of Your Medications Against Gossypol

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

From our Q&A

Questions About Gossypol or Furosemide

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Gossypol or Furosemide, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Furosemide

This page covers Gossypol only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Furosemide page lists 227 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), American Mistletoe (major), Asarabacca (major) and Lithium (major).

By severity: 9 major · 193 moderate · 25 minor.

From our pharmacist’s overview on the Furosemide page

“Yellow dock is where I would start with furosemide (Lasix). This water pill already flushes potassium, and heavy yellow dock use can compound that loss, one of nine major-rated interactions on a list of 227 that deserves genuine care.”

Reviewed by 2 · Jul 18, 2026

Open the Furosemide interaction page

How much people look this up

Where Gossypol and Furosemide 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 Gossypol
Top 25%

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

29 days ago today
Medication Furosemide
Steady interest

#1,542 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.

Supplement

About Gossypol

What is Gossypol?

Gossypol
  • Male contraception (research interest)
  • Reduction of sperm production
  • Endometriosis (historical/research)
  • Antiviral and antiparasitic research
  • Cancer cell research

Gossypol is a toxic yellow pigment from cotton plants that has been studied mainly as an experimental male contraceptive because it can lower sperm production. It is not an approved or safe over-the-counter supplement, and it carries serious risks including possibly permanent infertility, low potassium, and organ toxicity. It should not be used for self-treatment.

Read the full Gossypol monograph & all interactions
Medication

About Furosemide

What Is Furosemide Used For?

Brand name: Lasix

Furosemide tablets and oral solution are used in adults and children to treat edema (fluid buildup) caused by congestive heart failure, cirrhosis of the liver, and kidney disease, including nephrotic syndrome. In adults, oral furosemide is also used to treat high blood pressure, alone or alongside other blood pressure medications.

Furosemide injection is reserved for patients who cannot take oral medicine or for emergency situations such as acute pulmonary edema (sudden dangerous fluid in the lungs). Furoscix (subcutaneous injection) is specifically indicated for edema in adults with chronic heart failure or chronic kidney disease, including nephrotic syndrome, and in pediatric patients weighing at least 43 kg. Lasix Onyu (subcutaneous injection) is indicated for edema in adults with chronic heart failure only.

See full Furosemide drug information
Keep checking

Other Drugs & Gossypol

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

0Major
103Moderate
0Minor
2,726No known interaction
103 Moderate 2,726 No interaction
Moderate

103 interactions

Showing 60 of 103 moderate interactions — see all 103 on the Gossypol page.

No interaction 2,726 drugs checked — show the list

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

Showing the 60 most looked-up of 2,726 medications checked with no known interaction — see the full Gossypol list.

See the full Gossypol interactions page
See every supplement checked against Furosemide, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

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.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Gossypol monograph › Uses, safety, and every drug interaction in one place Furosemide supplement interactions › Every supplement checked against Furosemide, ranked by severity Furosemide drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Gossypol and Furosemide Together: Common Questions

Can you take Gossypol with Furosemide?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Gossypol and Furosemide interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Furosemide and Gossypol?

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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.