Ganirelix
Ganirelix is a GnRH antagonist that prevents a premature LH surge during controlled ovarian stimulation in assisted reproduction.
At a glance
- Evidence stage
- Approved use
- Regulatory status
- US ganirelix products, including FYREMADEL, are FDA-approved to inhibit premature LH surges in women undergoing controlled ovarian hyperstimulation.
- Research context
- Ganirelix is a GnRH antagonist that prevents a premature LH surge during controlled ovarian stimulation in assisted reproduction.
What this is
- Ganirelix is a GnRH antagonist that prevents a premature LH surge during controlled ovarian stimulation in assisted reproduction.
What this isn't
- A recommendation to use, prepare, combine, or administer a product
- Evidence that a related molecule or a differently formulated product has the same effects
Key terms
Ganirelix is a GnRH antagonist that prevents a premature LH surge during controlled ovarian stimulation in assisted reproduction.
Ganirelix occupies pituitary GnRH receptors and directly suppresses gonadotropin release. This helps keep ovulation from occurring before the planned stage of an assisted-reproduction cycle. The mechanism is suppression of a mistimed hormonal signal; it is not a treatment that creates new eggs or reverses age-related changes in ovarian biology. FYREMADEL prescribing information.
Evidence limits
How to read the evidence
The comparison studied whole fertility protocols, so differences cannot all be assigned to a single molecule. Prevention of an LH rise, egg retrieval, pregnancy, and live birth are different endpoints. Patient selection, other medicines, and embryo-transfer practices influence the final outcome, and this older trial does not establish superiority over every contemporary antagonist or agonist approach. Study design and outcomes; label scope.
Sources appraised 2026-10-28. Educational information; not medical advice. Study findings apply to the populations, preparations and outcomes described.
External sources and citations
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