Human RCT
Mensch
Reliably prevents the premature LH surge in IVF protocols.
What does NOT follow: Established approved use in the IVF context.
Peptide entry · Research other
Ganirelix
Orgalutran · Antagon · Fyremadel
Highest evidence
Human RCT
Studies recorded
1· 1 in humans
Legal status · US
PrescriptionScientific context only. Not medical advice, not a recommendation to use.
At a glance
Ganirelix is a synthetic decapeptide and GnRH antagonist. In assisted reproduction (IVF) it prevents the premature LH surge during controlled ovarian stimulation.
Researched for
IVF / controlled ovarian stimulationPrevention of premature LH surge
Official status
US: Prescription
FDA-approved (1999, Antagon) to prevent premature LH surge in IVF.
At a glance
Overview
What is it?
Ganirelix is a synthetic decapeptide and GnRH antagonist. In assisted reproduction (IVF) it prevents the premature LH surge during controlled ovarian stimulation.
How is it meant to work? →
Ganirelix competitively and reversibly binds the pituitary GnRH receptor, rapidly suppressing LH (and, less so, FSH) release — without the initial hormone 'flare' of GnRH agonists.
What do studies show? →
Human RCTReliably prevents the premature LH surge in IVF protocols.
What do users report?
No documented community reports.
01
Mechanism of action
Ganirelix competitively and reversibly binds the pituitary GnRH receptor, rapidly suppressing LH (and, less so, FSH) release — without the initial hormone 'flare' of GnRH agonists.
02
Evidence at a glance
Reading note. The distribution shows on which evidence tier each observation sits. Strong colours mark stronger evidence — weaker tiers are deliberately visible, not hidden.
03
What the studies show
Human trial
Mensch
Acts immediately (antagonist), without an initial 'flare'.
What does NOT follow: A mechanistic class difference from GnRH agonists; closely related to cetrorelix.
05
Pharmacokinetics
No robust pharmacokinetic human data available. A model curve is not invented.
06d
Safer use & risks
Risk notes for harm reduction — descriptive, not a usage or dosing guide.
This substance is approved (in at least one country) — use belongs in medical hands, within the approved indication and a physician-set dose.
Online numbers are not a benchmark
Amounts from TikTok, YouTube and forums are mostly imitation rather than data — and are often wrongly derived from animal studies (µg/kg). Not a reliable benchmark for humans.
Sterility & infection risk
Injection solutions prepared or stored non-sterile carry an infection and abscess risk. Contamination is common with grey-market product.
Unknown product quality
Research-/grey-market product is not quality-tested: identity, purity and actual content are often unknown, and counterfeits occur.
Mind interactions
Combinations with medications or pre-existing conditions can carry risks (see the Interactions section). Clarify with a doctor beforehand.
Warning signs — seek medical help
With persistent pain, redness/swelling at the injection site, fever, shortness of breath, racing heart, chest pain or allergic reactions, seek medical help immediately.
A doctor, not a forum
Concrete questions about use and amount belong in a conversation with a doctor — not in a comment thread.
07
Known adverse events from studies
Factual reporting of what studies observed. Not a safety statement for individual use.
Human trial
Injection-site reactions; ovarian hyperstimulation syndrome (stimulation context)
OHSS is primarily a consequence of the overall stimulation, not the antagonist alone.
kontextabhängig
07b
Interactions & combinations
Documented interactions and contraindications from studies, prescribing information and guidelines. Where no data exists, this is stated.
Reporting of risks, NOT a combination guide. The absence of an entry does not mean „safe to combine“ but „not sufficiently studied“.
No documented interactions recorded
We have not yet found robustly documented interactions for this peptide. This does NOT mean none exist — the data is limited.
11
Legal status by country
12
Reconstitution calculator
Pure mg/mL maths — works like a calculator. Not a usage recommendation.
Peptides ship as a dry powder. Once dissolved in a liquid (reconstitution), this calculator answers a single question: how much substance is in one millilitre of solution afterwards?
- 1Enter the vial's substance amount (printed on the label).
- 2Enter how much solvent you add.
- 3Result = concentration in mg per mL.
Printed on the label
/
Liquid you add
=
2.50
mg / mL
5 mg in 2 mL gives 2.50 mg/mL — each millilitre contains 2.50 mg of substance.
14
Study register
Human trialCohort study
· 2002
Obstetrical and neonatal outcome after controlled ovarian stimulation for IVF using the GnRH antagonist ganirelix
Findings:Ovarian stimulation with ganirelix was unremarkable/safe regarding pregnancy and neonatal outcomes.
15
Sources & method
Last reviewed
2026-06-11
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