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GnRH antagonist (decapeptide analog)

Ganirelix

Ganirelix is a synthetic decapeptide GnRH antagonist that competitively blocks the pituitary GnRH receptor. It is an approved prescription medicine used during controlled ovarian stimulation to prevent premature ovulation. This page is educational and is not medical advice.

By The Peptides Codex Editorial TeamReviewed July 10, 2026
Length
10 aa
Class
GnRH antagonist (decapeptide analog)
Function
Competitive gonadotropin-releasing hormone receptor antagonist
Context
Approved medicine used in assisted reproduction to control ovulation timing (prescription)

Injectable GnRH antagonist used to prevent premature ovulation during fertility treatment.

Also known as: Orgalutran · Antagon · GnRH antagonist

Part of the Foundational & therapeutic peptides cluster

Overview

Ganirelix is a synthetic decapeptide GnRH antagonist that competitively blocks the pituitary GnRH receptor. It is an approved prescription medicine used during controlled ovarian stimulation to prevent premature ovulation. This page is educational and is not medical advice.

Source & context

Biological / chemical source: Synthetic decapeptide analog of GnRH

Primary research or clinical context: Approved medicine used in assisted reproduction to control ovulation timing (prescription)

Use in fertility protocols

Ganirelix is given by daily subcutaneous injection during the stimulation phase of in-vitro fertilization. By suppressing the endogenous luteinizing hormone surge, it helps clinicians control the exact timing of egg retrieval.

Structural strategy

Ganirelix carries several D-amino-acid and other non-natural residue substitutions along the GnRH sequence. This medicinal-chemistry approach yields immediate, reversible receptor blockade with good metabolic stability.

FAQ about Ganirelix

What is Ganirelix?+

Ganirelix is a synthetic decapeptide GnRH antagonist that competitively blocks the pituitary GnRH receptor. It is an approved prescription medicine used during controlled ovarian stimulation to prevent premature ovulation. This page is educational and is not medical advice.

Is Ganirelix an approved medicine?+

Ganirelix: Approved medicine used in assisted reproduction to control ovulation timing (prescription). Always follow licensed medical guidance for approved products.

What is the typical length of Ganirelix?+

Ganirelix is commonly described as approximately 10 amino acids (GnRH antagonist (decapeptide analog)).

Related peptides

References & further reading

  1. 1.Wikipedia — Ganirelix
  2. 2.PubChem — compound summary for Ganirelix (CID 16186319)
Disclaimer: Educational content only. Not medical advice. Not instructions for human use. Research peptides and unapproved products may be restricted or illegal to market for human consumption in your jurisdiction. Consult qualified professionals and applicable law.
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Cite this: Peptides Codex — Ganirelix educational profile.
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