As of September 2026, cetrorelix is an approved medicine in the US and the EU. Its one approved use is to prevent early ovulation during IVF. The trials behind that approval tested the maker's product, Cetrotide, over short courses. If a vial of cetrorelix reached you outside a pharmacy, none of those trials tested it, and you cannot tell from the outside what it holds.
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What is cetrorelix?
Cetrorelix is a lab-made chain of ten amino acids that blocks a hormone signal in the pituitary gland. ASTA Medica developed it in the 1990s, and Merck Serono took it on later. The FDA and the EMA approved it in 1999 and 2000 under the brand Cetrotide.
Does cetrorelix work?
For its approved use, the FDA and the EMA reviewed the trials and approved it. Fertility clinics use it during IVF to stop a woman's own hormone surge from causing ovulation before eggs are collected.
What we found. 6+ completed randomized trials counted on the record. 3 study rows listed below, so the number shows with a plus sign until every trial is listed.
| Study | Tested in | Status | What it shows |
|---|---|---|---|
| Cetrotide approval trials (Phase 3) | People | Completed, reviewed by the FDA | Prevented the early hormone surge. They supported the 1999 approval |
| IVF studies comparing it with the long agonist approach | People | Completed, randomized | Pregnancy rates were comparable, with a shorter treatment |
| Early studies in prostate cancer and enlarged prostate | People | Discontinued | They did not lead to approval |
Is cetrorelix safe?
The record names two main concerns: reactions where the medicine is given, and rare allergic reactions. It describes a long, well-documented safety record in IVF. The medicine was only ever developed and tested for short courses, so long-term data outside IVF are limited. All of that describes the pharmacy product.
Is cetrorelix legal?
- United States
- Approved by the FDA in 1999 as Cetrotide, to prevent early ovulation during IVF.
- European Union
- Approved by the EMA in 2000 for the same use.
- Sport
- Not named on WADA's list. That is not clearance.
- Other uses
- Studied for prostate cancer, endometriosis and fibroids, and not approved for them. Those programs were stopped.
Not medical advice. Approval and sport status as of . Medical disclaimer
What is in a vial sold as cetrorelix?
The approval trials above tested Cetrotide, the maker's product. This record holds no sign that cetrorelix is sold outside pharmacies. If a vial reached you another way, none of those trials tested it, and the checklist lists what to ask the seller.
What don't we know?
- What long-term use outside short IVF courses does. It was only ever tested for short courses.
- Whether it helps in endometriosis or other unapproved uses. Those programs were stopped.
- What is in any vial that did not come from a pharmacy.
The other side
Cetrorelix comes with a prescription and a fertility clinic's care, and its record in IVF is long and well documented. The open question here is what happens outside that setting.
What would change this record?
- New controlled trials in a use that is not approved today, such as endometriosis.
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 cetrorelix
What is cetrorelix used for?
- To prevent early ovulation during IVF. That is its one approved use in the US and the EU.
Is cetrorelix the same as Cetrotide?
- Cetrotide is the brand name for cetrorelix.
Is cetrorelix banned in sport?
- It is not named on WADA's list. The record gives no sport source for that. If you compete, check the current List.
Was cetrorelix tested for anything besides IVF?
- Yes. It was studied for prostate cancer, endometriosis and fibroids. None of those uses was approved, and the programs were stopped.
Record checked on . Each source shows the date it was checked.