What is the half-life of Ganirelix?

Ganirelix has an approximate elimination half-life of 16.2 h.

How long does Ganirelix stay in your system?

Roughly 97% of a dose has cleared after five half-lives — about ~3 days for Ganirelix. That is the window that matters for washouts, bloodwork and surgery.

What are the risks of Ganirelix?

Prescribed by physicians experienced in infertility treatment; pregnancy must be excluded before starting Hypersensitivity reactions, including anaphylaxis, have been reported Contraindicated in known or suspected pregnancy

Ganirelix

ganirelix acetate

A synthetic decapeptide GnRH antagonist, used in fertility treatment to prevent a premature LH surge. Label half-life: 12.8 h after one injection, 16.2 h with repeated daily injections.

Half-life: 16.2 h
Out of system: ~3 days
Route: Subcutaneous
Level: —

Class (Gonadotropin-releasing hormone (GnRH) antagonist), half-life and route from the FDA label: Ganirelix Acetate Injection (U.S. National Library of Medicine, DailyMed), checked 2026-09-26.

What Ganirelix is used for

Inhibition of premature LH surges in women undergoing controlled ovarian hyperstimulation (FDA label)

How it's typically used

Prescription medicine in the US, used within a supervised fertility cycle. The prescriber sets the dose and schedule; the FDA label is cited on this page.

What to watch for

Prescribed by physicians experienced in infertility treatment; pregnancy must be excluded before starting
Hypersensitivity reactions, including anaphylaxis, have been reported
Contraindicated in known or suspected pregnancy

Common questions

What is the half-life of Ganirelix?: Ganirelix has an approximate elimination half-life of 16.2 h.
How long does Ganirelix stay in your system?: Roughly 97% of a dose has cleared after five half-lives — about ~3 days for Ganirelix. That is the window that matters for washouts, bloodwork and surgery.
How is Ganirelix taken?: Ganirelix is typically administered by the subcutaneous route. Prescription medicine in the US, used within a supervised fertility cycle. The prescriber sets the dose and schedule; the FDA label is cited on this page.
What are the risks of Ganirelix?: Prescribed by physicians experienced in infertility treatment; pregnancy must be excluded before starting Hypersensitivity reactions, including anaphylaxis, have been reported Contraindicated in known or suspected pregnancy

About Other research compounds

What they are: Nootropics, metabolic agents, and research compounds that don't fit the other classes.
How they're run: Route and schedule vary widely — check the individual entry.
What to watch: This is the least-characterised corner of the atlas. Read the full guide, and treat anything without published human data as exactly that.

Other other research compounds

Peptid AI is an educational and self-tracking tool — not a medical service, and not a vendor. Nothing here is medical advice, a prescription, or an endorsement. Doses reflect what is commonly reported in research literature; they are not recommendations. Many compounds listed are experimental, not approved for human use, and/or controlled substances that are illegal to possess without a prescription in many countries. Always consult a qualified physician before starting, changing, or stopping any protocol.