What is the half-life of Cetrorelix?

Cetrorelix has an approximate elimination half-life of 20.6 h.

How long does Cetrorelix stay in your system?

Roughly 97% of a dose has cleared after five half-lives — about ~4 days for Cetrorelix. That is the window that matters for washouts, bloodwork and surgery.

What are the risks of Cetrorelix?

Prescribed by physicians experienced in fertility treatment; pregnancy must be excluded before starting Hypersensitivity reactions, including anaphylactoid reactions with the first dose, have been reported Contraindicated in known or suspected pregnancy and during breastfeeding

Cetrorelix

Cetrotide

A synthetic decapeptide GnRH antagonist, used in fertility treatment to prevent a premature LH surge. Label half-life: 20.6 h with repeated daily injections; after a single injection, 5 h to 63 h depending on the dose.

Half-life: 20.6 h
Out of system: ~4 days
Route: Subcutaneous
Level: —

Class (Gonadotropin-releasing hormone (GnRH) antagonist), half-life and route from the FDA label: Cetrotide (cetrorelix acetate for injection) (U.S. National Library of Medicine, DailyMed), checked 2026-09-26.

What Cetrorelix is used for

Inhibition of premature LH surges in women undergoing controlled ovarian stimulation (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 fertility treatment; pregnancy must be excluded before starting
Hypersensitivity reactions, including anaphylactoid reactions with the first dose, have been reported
Contraindicated in known or suspected pregnancy and during breastfeeding

Common questions

What is the half-life of Cetrorelix?: Cetrorelix has an approximate elimination half-life of 20.6 h.
How long does Cetrorelix stay in your system?: Roughly 97% of a dose has cleared after five half-lives — about ~4 days for Cetrorelix. That is the window that matters for washouts, bloodwork and surgery.
How is Cetrorelix taken?: Cetrorelix 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 Cetrorelix?: Prescribed by physicians experienced in fertility treatment; pregnancy must be excluded before starting Hypersensitivity reactions, including anaphylactoid reactions with the first dose, have been reported Contraindicated in known or suspected pregnancy and during breastfeeding

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.