Prescription
GnRH Antagonist (Fertility Hormone Blocker)
Cetrorelix
Last reviewed April 2026
Who is this for?
What is this drug?
Cetrorelix is an injectable hormone-blocking medicine that stops your body from releasing eggs too early during fertility treatment — it works by blocking a natural hormone called GnRH that controls ovulation.
What is it used for?
Prevention of premature ovulation during assisted reproduction (IVF or fertility treatment)
Prescription Required
A doctor's prescription is required to obtain this drug legally.