As of September 2026, leuprolide is an approved medicine in the US and the EU. The FDA approvals cover prostate cancer, endometriosis, uterine fibroids and central precocious puberty. Its original trials predate modern trial registries. WADA bans it in men in sport. If a vial of leuprolide reached you outside a pharmacy, you cannot tell from the outside what it holds.
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What is leuprolide?
Leuprolide is a lab-modified version of GnRH, the brain signal that controls sex-hormone production. It binds the GnRH receptor in a sustained way, first raising testosterone or estrogen and then sharply suppressing them. The FDA approved an early version in the 1980s for advanced prostate cancer, and later versions for endometriosis, uterine fibroids and central precocious puberty in children.
Does leuprolide work?
The FDA reviewed the trials and approved it for prostate cancer, endometriosis, uterine fibroids and central precocious puberty. Its original trials predate modern trial registries, because it has been on the market since the 1980s.
What we found. 6+ completed randomized trials counted on the record. 1 study row listed below, so the number shows with a plus sign until every trial is listed. The study list held two more rows, a label and a Federal Register notice, and both are now in the legal section.
| Study | Tested in | Status | What it shows |
|---|---|---|---|
| Original Lupron approval application, for prostate cancer | People | Approved 1985 | The record says it showed testosterone suppression and clinical benefit in advanced prostate cancer |
Is leuprolide safe?
The record's key concerns in people include an early hormone flare before suppression sets in, bone density loss with prolonged use, and menopause-like side effects in women. The original trials predate modern trial registries, so their data are harder to find in one place than for newer peptide drugs. That is the record for the medicine a pharmacy supplies. A vial of unknown origin is the next section's subject.
Is leuprolide legal?
- United States
- Approved by the FDA since 1985, first for advanced prostate cancer. Later approvals added endometriosis, uterine fibroids and central precocious puberty. The record names the brand Lupron Depot.
- The label
- The current Lupron Depot label is still being updated. It documents the approved uses and the safety data gathered over decades.
- Federal Register, 2019
- A notice confirmed that an older version of Lupron was not withdrawn for safety or effectiveness reasons.
- European Union
- Approved by the EMA. The record says only "equivalent indications".
- Sport
- Banned in men at all times. WADA's 2026 Prohibited List covers GnRH and its agonist analogues, leuprorelin among them, in class S2 as testosterone-stimulating peptides in males.
Not medical advice. Approval and sport status as of . Medical disclaimer
What is in a vial sold as leuprolide?
Lupron Depot is the brand this record names for the FDA approval. The record holds no sign that leuprolide is sold outside pharmacies. If a vial reached you another way, nothing in the approval file above tested it, and the checklist lists what to ask the seller.
What don't we know?
- What the original trial data show in full. They predate modern registries and are harder to find in one place.
- Whether one modern systematic review covers the evidence for all its approved uses. The record points to none.
- What is in any vial that did not come from a pharmacy.
The other side
Leuprolide comes with a prescription and a doctor's care, and it has been on the market since the 1980s. The gap on this page is about access to old trial data. The record raises no doubt about the approvals themselves.
What would change this record?
- A modern systematic review that brings together the evidence for all its approved uses.
- An FDA summary of safety data gathered after approval, across all its approved uses. The record says either one would make the evidence easier to trace.
Change log
- Sport line made exact: banned in men, at all times, under class S2 of WADA's 2026 Prohibited List.
- Record checked. No change logged yet.
Three questions to ask next
- What does 'research use only' actually mean?
- How can you tell if a peptide vendor is legitimate?
- How do you read a certificate of analysis?
Ask better questions.
More questions about leuprolide
Is leuprolide the same as Lupron?
- Lupron is the brand name for leuprolide. The record names Lupron Depot as the product the FDA approved.
What is leuprolide approved for?
- In the US: prostate cancer, endometriosis, uterine fibroids and central precocious puberty, a form of early puberty in children. The record says the EU approvals are equivalent.
Is leuprolide banned in sport?
- In men, yes. WADA's 2026 Prohibited List names leuprorelin, another name for leuprolide, among the GnRH agonists it bans in males at all times, in class S2.
Why does leuprolide cause a hormone flare at first?
- It binds the same receptor as natural GnRH, in a sustained way. The record says that first raises testosterone or estrogen and then sharply suppresses them.
Is leuprolide the same as degarelix?
- No. Leuprolide is a GnRH agonist that first raises hormone levels and then suppresses them. Degarelix blocks the GnRH receptor directly.
Record checked on . Each source shows the date it was checked.
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