Evidence Grade A — Regulatory approved. 571 published studies. 127 registered clinical trials.
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Cetrorelix (sold as Cetrotide) is an injectable medication used during IVF and other fertility treatments to prevent the body from ovulating too early, before eggs are ready to be collected. Available as a daily injection or a single higher dose, it gives fertility specialists precise control over timing — a critical factor in the success of assisted reproduction.
Cetrorelix is also known by these brand and alternate names:
571 published studies: 370 human, 142 animal, 168 in-vitro, 46 reviews
Cetrorelix is marketed as Cetrotide (approved 2000) for the prevention of premature ovulation in women undergoing controlled ovarian stimulation for IVF. It is available as a 0.25 mg daily injection or a 3 mg single dose, both administered subcutaneously.
Cetrorelix is used as part of the GnRH antagonist IVF protocol, which has become the dominant approach in fertility clinics worldwide, largely replacing the older GnRH agonist ('long') protocol. The antagonist approach requires fewer injections, a shorter stimulation period, and carries a lower risk of ovarian hyperstimulation syndrome — a potentially serious complication of fertility treatment. Cetrorelix competes directly with ganirelix in this market, with both agents showing equivalent clinical outcomes.
During fertility treatment, the ovaries are stimulated to develop multiple eggs simultaneously. The risk is that the body's natural LH surge triggers ovulation too early, before the eggs can be collected. Cetrorelix directly blocks the GnRH receptor in the pituitary gland, preventing this premature LH surge. Unlike GnRH agonists, which cause an initial hormone spike before suppression, cetrorelix provides immediate suppression with no flare — and its effects reverse quickly once stopped, which is important for the precisely timed sequences required in IVF.
Cetrorelix, along with the similar drug ganirelix, helped establish the GnRH antagonist approach to IVF that is now the dominant protocol worldwide. Multiple large analyses confirm that this approach achieves pregnancy rates comparable to the older, longer protocols while requiring fewer injections, shorter treatment courses, and carrying a lower risk of ovarian hyperstimulation syndrome — a potentially serious complication. No meaningful clinical differences have been demonstrated between cetrorelix and ganirelix; the choice between them is typically driven by local availability, cost, and practical factors like prefilled syringe convenience. Generic versions have improved access. Some research has explored cetrorelix for endometriosis and uterine fibroids, though oral alternatives have largely taken over that research space.
PeptideTrace tracks 127 registered clinical trials for Cetrorelix sourced from ClinicalTrials.gov.
GnRH Agonist and Antagonists in an Oocyte Donation Program
Administration of Increased Dose of GnRH Antagonist for Coasting for Decreasing the Risk for Ovarian Hyperstimulation Syndrome( OHSS)
Comparison of the Euploid Rate of Blastocyst Between PPOS and GnRH Antagonist Protocol in Women With PCOS Undergoing PGT-A
A Study to Compare the Efficacy and Safety of Follitropin Alfa/Lutropin Alfa Versus hMG in Japanese Participants With LH and FSH Deficiency Undergoing ART (HINATA)
Trial Comparing Subcutaneous Natural Progesterone (Prolutex) vs. Cetrorelix Acetate for Luteinizing Hormone Surge Suppression in Freeze-All IVF Cycles.
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Cetrorelix is a synthetic decapeptide (10 amino acids) GnRH antagonist. It competitively blocks the GnRH receptor without causing an initial hormonal flare. It is formulated as a lyophilized powder for subcutaneous injection.
Cetrorelix binds competitively to GnRH receptors in the anterior pituitary, directly blocking endogenous GnRH-stimulated release of LH and FSH. Onset of LH suppression occurs within approximately 1 hour of the 3 mg dose. Effects are dose-dependent and rapidly reversible—LH/FSH levels recover within 48 hours of the last dose, making it well suited for controlled ovarian stimulation protocols.
Cetrorelix is marketed as Cetrotide (approved August 11, 2000) for prevention of premature LH surges during controlled ovarian stimulation in IVF/ART protocols. Available as 0.25 mg daily dose (multiple-dose protocol) or 3 mg single dose. Used in the GnRH antagonist IVF protocol as an alternative to the longer agonist down-regulation protocol.
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Carbetocin has not been approved by the FDA. It is registered in over 80 countries for prevention of uterine atony and excessive bleeding after caesarean delivery. A heat-stable formulation was added to the WHO Essential Medicines List in 2019. The CHAMPION trial (WHO, 2018; over 29,000 women) compared a heat-stable carbetocin formulation to oxytocin for preventing postpartum haemorrhage after vaginal delivery, and found it to be non-inferior. The heat-stable formulation addresses a significant limitation of oxytocin, which degrades in warm climates without refrigeration — a major concern in low-resource settings where postpartum haemorrhage causes the most deaths. Its regulatory status varies by jurisdiction.
Nafarelin is marketed as Synarel (approved 1990) for endometriosis and central precocious puberty. It requires administration as one spray in each nostril twice daily — a higher frequency than injectable alternatives but avoids needles entirely, which can be a significant advantage for some patients, particularly children. Clinical trials showed symptom improvement in 75–92% of endometriosis patients. However, absorption can be affected by nasal congestion or concurrent use of nasal decongestants, which can be a practical limitation. As with all GnRH agonists, prolonged use leads to bone density loss, and treatment for endometriosis is typically limited to six months. Nafarelin occupies a niche for patients who prefer non-injectable hormone suppression, though it has become less commonly prescribed as longer-acting depot injections and oral alternatives have become available.
Triptorelin is marketed as Trelstar (approved 2000) for advanced prostate cancer, available as intramuscular depot injections in monthly (3.75 mg), three-monthly (11.25 mg), and six-monthly (22.5 mg) formulations. It is also widely used internationally for gender-affirming care and central precocious puberty. Triptorelin is one of the most commonly used GnRH agonists globally, though it faces the same competitive pressure as other agents in this class from newer oral GnRH antagonists like relugolix, which avoid the initial hormone flare and offer potential cardiovascular advantages. Clinical data demonstrate reliable testosterone suppression comparable to other GnRH agonists in this class.
This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making decisions about your health.
