IVF & treatment
In a long protocol, a GnRH agonist is taken before stimulation so the clinic controls the timing of follicle growth and ovulation. Not every IVF cycle includes a down-regulation stage.
Also known as: down-reg, downregulation
Last reviewed: 23 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.