Drug & supplement interaction

Gossypol + Pralsetinib

Pralsetinib brand name: Gavreto.

No Known Interaction

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Updated July 2026 · Pair last verified Sep 20, 2026

The bottom line No known interaction

We found no known interaction between Gossypol and Pralsetinib in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the label for Pralsetinib states a food rule worth keeping to, and the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Gossypol and Pralsetinib

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Pralsetinib and Gossypol in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Gossypol safety at a glance

Gossypol overall Avoid Gossypol is toxic and is not approved as a safe dietary supplement.

Pregnancy Likely Unsafe When used orally; gossypol seems to have abortifacient and uterine stimulant effects, avoid using. Read the full pregnancy detail

Breastfeeding Possibly Unsafe When used orally; avoid using. Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Pralsetinib and Gossypol? Ask Dr. Brian Staiger, PharmD, BCPS directly ›

How we checked

Why No Interaction Is Listed for Pralsetinib

Interactions in our licensed database are recorded against drug classes, not just single drug names. Pralsetinib is filed under 5 classifications — including qt interval-prolonging drugs, p-glycoprotein substrates, hepatotoxic drugs. Gossypol has documented interactions with 4 drug classes — the most serious being digoxin (lanoxin) (moderate), diuretic drugs (moderate) and stimulant laxatives (moderate) — and none of Pralsetinib’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Gossypol Does Interact With Other Medications

Gossypol has 104 moderate known drug interactions in our database — Pralsetinib isn’t one of them. If you take anything else, check it against the full list below.

Moderate 104 No known interaction 2,726 (incl. Pralsetinib)

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.

What to actually watch for

No Interaction Found — But Data Suggests Gossypol and Pralsetinib May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do. 3 of them are worth acting on rather than waiting out — marked below.

A low platelet count Worth acting on Additional detail
Gossypol
“Orally, two cases of mild thrombocytopenia have been reported after taking high doses of gossypol.”

Gossypol · Natural Medicines adverse-effect record, reported in thrombocytopenia.
1 source cited

52616. 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
Pralsetinib

Listed in the ADVERSE REACTIONS section of the FDA label for Pralsetinib. Read the label on DailyMed ›
Liver problems Worth acting on Additional detail

Gossypol

“Orally, gossypol seems to be well-tolerated when used at doses below 20 mg daily, short-term. Using gossypol long-term or in doses greater than 20 mg daily may be unsafe.

Most Common Adverse Effects:

Orally: Diarrhea, hypokalemia, nausea, and vomiting.

Serious Adverse Effects (Rare):

Orally: When used long-term or in high doses, circulatory problems, dermatologic toxicity, heart failure, hepatotoxicity, infertility (…”

Gossypol · Natural Medicines adverse-effect record, reported in congestive heart failure (chf).

Pralsetinib

Listed in the ADVERSE REACTIONS section of the FDA label for Pralsetinib. Read the label on DailyMed ›
Bleeding or bruising Worth acting on Additional detail
Gossypol
“Orally, gossypol has been reported to cause nausea in 30% of subjects, vomiting in 15% of subjects, and diarrhea in 10% of subjects in one clinical study. High doses may cause mucosal sloughing, mucosal necrosis, and intestinal hemorrhage. Gossypol has also been reported to cause anorexia, malnutrition, and altered taste sensation.”

Gossypol · Natural Medicines adverse-effect record, reported in anorexia.
6 sources cited

52634. Van Poznak, C., Seidman, A. D., Reidenberg, M. M., Moasser, M. M., Sklarin, N., Van Zee, K., Borgen, P., Gollub, M., Bacotti, D., Yao, T. J., Bloch, R., Ligueros, M., Sonenberg, M., Norton, L., and Hudis, C. Oral gossypol in the treatment of patients wit

166. Miller LG. Herbal Medicinals: Selected clinical considerations focusing on known or potential drug-herb interactions. Arch Intern Med 1998;158:2200-11.

8290. Coutinho EM, Athayde C, Atta G, et al. Gossypol blood levels and inhibition of spermatogenesis in men taking gossypol as a contraceptive. A multicenter, international, dose-finding study. Contraception 2000;61:61-7. PubMed

52824. 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

8292. Herve JC, Pluciennik F, Bastide B, et al. Contraceptive gossypol blocks cell-to-cell communication in human and rat cells. Eur J Pharmacol 1996;313:243-55. PubMed

52665. Randel, R. D., Chase, C. C., Jr., and Wyse, S. J. Effects of gossypol and cottonseed products on reproduction of mammals. J.Anim Sci. 1992;70(5):1628-1638. PubMed
Pralsetinib

Listed in the ADVERSE REACTIONS section of the FDA label for Pralsetinib. Read the label on DailyMed ›
A change in taste / Reduced appetite Additional detail

Gossypol

Recorded for Gossypol in the same Natural Medicines adverse-effect record shown under Bleeding or bruising above.

Pralsetinib

Listed in the ADVERSE REACTIONS section of the FDA label for Pralsetinib. Read the label on DailyMed ›
Tiredness reported in 13.8% of FDA reports for Pralsetinib Additional detail
Gossypol
“Orally, several studies have found a limited association between gossypol use and fatigue, while another study found no correlation.”

Gossypol · Natural Medicines adverse-effect record, reported in fatigue.
5 sources cited

52819. Liu, G. Z. Clinical study of gossypol as a male contraceptive. Reproduccion. 1981;5(3):189-193.

52749. Coutinho, E. M. and Melo, J. F. Clinical experience with gossypol in non-Chinese men: a follow-up. Contraception 1988;37(2):137-151. PubMed

52634. Van Poznak, C., Seidman, A. D., Reidenberg, M. M., Moasser, M. M., Sklarin, N., Van Zee, K., Borgen, P., Gollub, M., Bacotti, D., Yao, T. J., Bloch, R., Ligueros, M., Sonenberg, M., Norton, L., and Hudis, C. Oral gossypol in the treatment of patients wit

52824. 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

46316. Liu, G. Z., Lyle, K. C., and Cao, J. Clinical trial of gossypol as a male contraceptive drug. Part I. Efficacy study. Fertil.Steril. 1987;48(3):459-461. PubMed
Pralsetinib

Listed in the ADVERSE REACTIONS section of the FDA label for Pralsetinib, and in voluntary FDA adverse-event reports. Read the label on DailyMed ›
Diarrhea / Vomiting / Nausea Additional detail

Gossypol

Recorded for Gossypol in the same Natural Medicines adverse-effect record shown under Liver problems above.

Pralsetinib

Listed in the ADVERSE REACTIONS section of the FDA label for Pralsetinib. Read the label on DailyMed ›

Reported for Gossypol but not commonly for Pralsetinib: heart failure, low potassium, changes to your period and a bowel blockage.

Effects for Pralsetinib come from the ADVERSE REACTIONS section of its FDA label; effects for Gossypol come from the Natural Medicines adverse-effect record, quoted above. Where a percentage is shown, it is the share of 1,699 voluntary FDA FAERS reports for Pralsetinib that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Gossypol in Pregnancy & Breastfeeding

Pregnancy Likely Unsafe

When used orally; gossypol seems to have abortifacient and uterine stimulant effects, avoid using.

Lactation Possibly Unsafe

When used orally; avoid using.

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.© 2026 Therapeutic Research Center

How to take them

Some Pralsetinib Products Have a Food Rule — Gossypol Should Not Break It

At least one FDA label for a product containing Pralsetinib says to take it on an empty stomach. Most supplements — Gossypol included — are taken with a meal, so the easy mistake is swallowing both together at breakfast. Where that rule applies, keep Pralsetinib on its own and move Gossypol to a meal later in the day.

This may not be true of your version. Food instructions belong to the product, not the ingredient: two Pralsetinib products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.

( 2.1 , 14 ) The recommended dosage in adults and pediatric patients 12 years and older is 400 mg orally once daily on an empty stomach (no food intake for at least 2 hours before and at least 1 hour after taking GAVRETO).

From the Dosage and Administration section of the FDA label we read for Pralsetinib — where that label names a specific product, the instruction is that product's. Read the label on DailyMed ›

A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.

Overlapping uses

What Pralsetinib Is Prescribed For, and What Gossypol Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Pralsetinib is a prescription medicine with approved uses on its FDA label. Gossypol is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Pralsetinib is prescribed for: Gavreto (pralsetinib) is used to treat adults with metastatic RET fusion-positive non-small cell lung cancer (NSCLC) — a type of lung cancer that has spread and carries a specific genetic alteration detected by an FDA-approved test. Gavreto is also approved for adults and children aged 12 and older with advanced or metastatic RET fusion-positive thyroid cancer who need systemic (whole-body) treatment and whose cancer no longer responds to radioactive iodine (when radioactive iodine is an appropriate option). This thyroid cancer use is under accelerated approval, meaning continued approval depends on results from confirmatory clinical trials.

Gossypol has been studied for:

Lung cancer studied, not established Gossypol has been studied for this. Natural Medicines rates the evidence: Possibly Ineffective Read what the research shows

Gossypol for lung cancer

Several clinical studies suggest that oral gossypol does not improve survival rates or reduce tumor progression in patients with advanced or recurrent non-small cell lung cancer (NSCLC).

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Pralsetinib on your own; if you are taking Gossypol for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Pralsetinib

This page covers Gossypol only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Pralsetinib page lists 181 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), Arsenic (major), Beer (major) and Cesium (major).

By severity: 11 major · 134 moderate · 36 minor.

From our pharmacist’s overview on the Pralsetinib page

“With pralsetinib (Gavreto), a targeted therapy for RET-driven lung and thyroid cancers, I would treat this list as required reading rather than background noise. Most of the interactions change how much of the drug the body actually gets: grapefruit can push its levels higher, while St.”

Reviewed by 2 · Jul 18, 2026

Open the Pralsetinib interaction page

How much people look this up

Where Gossypol and Pralsetinib 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

Steady interest

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

29 days ago today

Medication Pralsetinib

Steady interest

#2,410 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.

Where does our data come from?

Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Gossypol reference on this page ↓
Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Gossypol and Pralsetinib records this page draws on were last updated July 11, 2026.
What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.

Data structure & sourcing designed and verified by Dr. Brian Staiger, PharmD, BCPS.

Supplement

About Gossypol

What is 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.

Gossypium hirsutum · Malvaceae · Seeds (cottonseed) and seed oil; the pigment gossypol is extracted from these · Purified compound used in research; not commonly sold as a standardized consumer supplement

An interaction check asks whether these two react with each other — it does not ask whether Gossypol is a good idea for someone in your situation. Here is what our Gossypol record says about it on its own.

Gossypol: dosing

There is no established safe or standardized dose of gossypol for supplement use. The doses studied in research were used under medical supervision and still carried serious risks.Because gossypol is toxic and not approved as a dietary supplement, we cannot recommend any specific amount. If you encounter a product that lists gossypol, do not use it without first speaking to a pharmacist or doctor, and follow any professional guidance rather than a product label alone.

From our Gossypol monograph — the full record covers uses, side effects and every documented interaction.

Read the full Gossypol monograph & all interactions

Medication

About Pralsetinib

What Is Pralsetinib Used For?

Brand name: Gavreto

Gavreto (pralsetinib) is used to treat adults with metastatic RET fusion-positive non-small cell lung cancer (NSCLC) — a type of lung cancer that has spread and carries a specific genetic alteration detected by an FDA-approved test.

Gavreto is also approved for adults and children aged 12 and older with advanced or metastatic RET fusion-positive thyroid cancer who need systemic (whole-body) treatment and whose cancer no longer responds to radioactive iodine (when radioactive iodine is an appropriate option). This thyroid cancer use is under accelerated approval, meaning continued approval depends on results from confirmatory clinical trials.

Most-Reported Side Effects for Pralsetinib

From FAERS, the FDA’s public side-effect reporting system (1,788 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Product prescribing issue 181 reports

Fatigue 126 reports

Asthenia 116 reports

Anemia 98 reports

Hypertension 96 reports

See full Pralsetinib 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

104Moderate

0Minor

2,725No known interaction

104 Moderate 2,725 No interaction

Moderate

104 interactions

Showing 60 of 104 moderate interactions — see all 104 on the Gossypol page.

No interaction 2,725 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 2,725 medications checked with no known interaction — see the full Gossypol list.

See the full Gossypol interactions page

See every supplement checked against Pralsetinib, ranked by severity

Evidence & sources

Gossypol References

The 53 references that drive our Gossypol 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.

The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
Miller LG. Herbal Medicinals: Selected clinical considerations focusing on known or potential drug-herb interactions. Arch Intern Med 1998;158:2200-11.
Cowart CL, London SN, Vernon MW, Pedigo NG. The effects of cyclic adenosine monophosphate, forskolin, and theophylline on motility parameters in gossypol-treated human sperm. Fertil Steril 1994;61:929-34. PubMed
Coutinho EM. Gossypol: a contraceptive for men. Contraception 2002;65:259-63. PubMed
Guo J, Reidenberg MM. Inhibition of 11beta-hydroxysteroid dehydrogenase by bioflavonoids and their interaction with furosemide and gossypol. J Lab Clin Med 1998;132:32-8.
Coutinho EM, Athayde C, Atta G, et al. Gossypol blood levels and inhibition of spermatogenesis in men taking gossypol as a contraceptive. A multicenter, international, dose-finding study. Contraception 2000;61:61-7. PubMed
Herve JC, Pluciennik F, Bastide B, et al. Contraceptive gossypol blocks cell-to-cell communication in human and rat cells. Eur J Pharmacol 1996;313:243-55. PubMed
Taylor GT, Griffin MG, Bardgett M. Search for a male contraceptive: the effect of gossypol on sexual motivation and epididymal sperm. J Med 1991;22:29-44.
Woolley, R. J. Contraception--a look forward, Part II: Mifepristone and gossypol. J.Am.Board Fam.Pract. 1991;4(2):103-113.
Liu, G. Z., Lyle, K. C., and Cao, J. Clinical trial of gossypol as a male contraceptive drug. Part I. Efficacy study. Fertil.Steril. 1987;48(3):459-461. PubMed
Qian, S. Z. and Wang, Z. G. Gossypol: a potential antifertility agent for males. Annu.Rev.Pharmacol.Toxicol. 1984;24:329-360. PubMed
Qian, S. Z., Jing, G. W., Wu, X. Y., Xu, Y., Li, Y. Q., and Zhou, Z. H. Gossypol related hypokalemia. Clinicopharmacologic studies. Chin Med.J.(Engl.) 1980;93(7):477-482.
Flack, M. R., Pyle, R. G., Mullen, N. M., Lorenzo, B., Wu, Y. W., Knazek, R. A., Nisula, B. C., and Reidenberg, M. M. Oral gossypol in the treatment of metastatic adrenal cancer. J.Clin.Endocrinol.Metab 1993;76(4):1019-1024. PubMed
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
Reidenberg, M. M. Environmental inhibition of 11beta-hydroxysteroid dehydrogenase. Toxicology 4-3-2000;144(1-3):107-111.
Gu, Z. P., Mao, B. Y., Wang, Y. X., Zhang, R. A., Tan, Y. Z., Chen, Z. X., Cao, L., You, G. D., and Segal, S. J. Low dose gossypol for male contraception. Asian J.Androl 2000;2(4):283-287.
Van Poznak, C., Seidman, A. D., Reidenberg, M. M., Moasser, M. M., Sklarin, N., Van Zee, K., Borgen, P., Gollub, M., Bacotti, D., Yao, T. J., Bloch, R., Ligueros, M., Sonenberg, M., Norton, L., and Hudis, C. Oral gossypol in the treatment of patients wit
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.
Kovacic, P. Mechanism of drug and toxic actions of gossypol: focus on reactive oxygen species and electron transfer. Curr.Med.Chem. 2003;10(24):2711-2718. PubMed
Randel, R. D., Chase, C. C., Jr., and Wyse, S. J. Effects of gossypol and cottonseed products on reproduction of mammals. J.Anim Sci. 1992;70(5):1628-1638. PubMed
Ray, S., Verma, P., and Kumar, A. Development of male-fertility-regulating agents. Med.Res.Rev. 1991;11(5):437-472. PubMed
Zhong, C. Q., Lui, Q. L., Tang, Y. J., Wang, Y., Shi, F. J., and Qian, S. Z. Study on sperm function in men long after cessation of gossypol treatment. Contraception 1990;41(6):617-622. PubMed
Porat, O. Effects of gossypol on the motility of mammalian sperm. Mol.Reprod.Dev. 1990;25(4):400-408. PubMed
Meade, V. Contraceptive development lags in U.S. Am.Pharm. 1990;NS30(5):22-23. PubMed
Gui-Yuan, Z., Meng-Chun, J., Jin-Lai, C., and Wen-Qing, Y. The effect of long-term treatment with crude cotton seed oil on pituitary and testicular function in men. Int J Androl 1989;12(6):404-410. PubMed
Xu, L. F., Wang, M., and Zhao, C. L. [Clinical effects and experimental study on gossypol in endometriosis]. Zhong.Xi.Yi.Jie.He.Za Zhi. 1989;9(8):462-4, 451.
Wu, Y. W., Chik, C. L., and Knazek, R. A. An in vitro and in vivo study of antitumor effects of gossypol on human SW-13 adrenocortical carcinoma. Cancer Res. 7-15-1989;49(14):3754-3758.
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
YU, T. W. [Ultrastructural study of the testis in 22 persons based on the effect of gossypol]. Zhonghua Bing.Li Xue.Za Zhi. 1987;16(1):60-61.
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.
Meng, G. D., Zhu, J. C., Chen, Z. W., Wong, L. T., Zhang, G. Y., Hu, Y. Z., Ding, J. H., Wang, X. H., Qian, S. Z., Wang, C., and . Follow-up of men in the recovery period immediately after the cessation of gossypol treatment. Contraception 1988;37(2):119 PubMed
Glander, H. J. [Gossypol and other nonhormonal substances for the inhibition of male fertility]. Zentralbl.Gynakol. 1988;110(12):772-777.
Wu, D. F., Reidenberg, M. M., and Drayer, D. E. Determination of gossypol enantiomers in plasma after administration of racemate using high-performance liquid chromatography with precolumn chemical derivatisation. J.Chromatogr. 12-9-1988;433:141-148. PubMed
Wu, D. F., Yu, Y. W., and Zheng, D. K. [Determination of (+)- and (-)-gossypol in human plasma using high performance liquid chromatography with pre-column chemical derivatization]. Yao Xue.Xue.Bao. 1988;23(12):927-932.
Coutinho, E. M. and Melo, J. F. Clinical experience with gossypol in non-Chinese men: a follow-up. Contraception 1988;37(2):137-151. PubMed
Liu, G. Z. and Lyle, K. C. Clinical trial of gossypol as a male contraceptive drug. Part II. Hypokalemia study. Fertil.Steril. 1987;48(3):462-465. PubMed
Liu, G. Z., Lyle, K. C., and Cao, J. Experiences with gossypol as a male pill. Am.J.Obstet.Gynecol. 1987;157(4 Pt 2):1079-1081. PubMed
Meng, G. D., Zhu, J. C., Chen, Z. W., Wong, L. T., Zhang, G. Y., Hu, Y. Z., Ding, J. H., Wang, X. H., Qian, S. Z., Wang, C., and . Recovery of sperm production following the cessation of gossypol treatment: a two-centre study in China. Int.J.Androl 1988; PubMed
Kjaergaard, N. [Male contraception]. Ugeskr.Laeger 9-8-1986;148(37):2335-2338.
Qian, S. Z. Gossypol-hypokalaemia interrelationships. Int.J.Androl 1985;8(4):313-324. PubMed
Wang, C. and Yeung, R. T. Gossypol and hypokalaemia. Contraception 1985;32(3):237-252. PubMed
Gao, H., Yang, Z. S., and Jin, S. X. [Primary observations on distal renal tubule acidosis in 177 cases caused by gossypol intoxication]. Zhonghua Nei Ke.Za Zhi. 1985;24(7):419-21, 447.
Cao, J. and Liu, G. Z. [Reversibility of azoospermia following gossypol withdrawal]. Zhongguo Yi.Xue.Ke.Xue.Yuan Xue.Bao. 1983;5(4):227-230.
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.
Penningroth, S. M. Pharmacological basis of therapeutics: gossypol, an oral male contraceptive? J.Med.Soc.N.J. 1984;81(8):663-665.
Demoulin, A. [Male contraception]. Rev Med Liege 4-1-1984;39(7):266-272.
Liu, G. Z. Clinical study of gossypol as a male contraceptive. Reproduccion. 1981;5(3):189-193.
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
Waites, G. M. Male fertility regulation: the challenges for the year 2000. Br.Med Bull. 1993;49(1):210-221. PubMed
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
Fan, L. P., Ren, C. Q., and Hou, T. X. [Emergency treatment and care of hypokalemia paralysis due to gossypol poisoning]. Zhonghua Hu Li Za Zhi. 9-5-1995;30(9):522-525.
Waites, G. M., Wang, C., and Griffin, P. D. Gossypol: reasons for its failure to be accepted as a safe, reversible male antifertility drug. Int.J.Androl 1998;21(1):8-12. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Gossypol and Pralsetinib Together: Common Questions

Is it safe to take Gossypol with Pralsetinib?

We do not list a known interaction between Gossypol and Pralsetinib. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.

Do Gossypol and Pralsetinib have any of the same side effects?

Yes — our sources link each of them separately to 9 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.

Should I take Gossypol and Pralsetinib at the same time of day?

At least one FDA label for a product containing Pralsetinib says to take it on an empty stomach, and supplements are usually taken with a meal — so taking them together at breakfast is the easy mistake. Where that applies, keep Pralsetinib on its own and move Gossypol to a meal later in the day. Food instructions belong to the product rather than the ingredient, so check the directions on your own box. This is about absorption, not an interaction.

Are Gossypol and Pralsetinib used for the same thing?

They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Gossypol in each. That is a conversation for your prescriber, especially if Pralsetinib is being adjusted to a target.

How was the Gossypol and Pralsetinib combination checked?

Interactions in our licensed database are recorded against drug classes. Pralsetinib is filed under 5 classifications, and Gossypol has documented interactions with 4 drug classes — none of Pralsetinib's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.

Does Gossypol interact with any other medications?

Yes. Gossypol has 104 documented drug interactions in our database — Pralsetinib is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.

Does Pralsetinib interact with any supplements?

Yes. Pralsetinib has documented interactions with 181 supplements in our database — Gossypol is not one of them. The Pralsetinib interaction page linked on this page lists every one, ranked by severity.

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

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Keep Exploring

Gossypol monograph Uses, safety profile, and every drug interaction in one place Pralsetinib drug information The full plain-English guide to this medication Pralsetinib supplement interactions Every supplement checked against Pralsetinib, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 53 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

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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.