Back to glossary

Fertility Glossary

Down-regulation

Temporarily switching off natural hormone signals before stimulation.

Treatment

Down-regulation uses a GnRH agonist to suppress the pituitary so the cycle can be controlled entirely by prescribed medicines. Temporary menopause-like side effects such as hot flushes and headaches are common while it takes effect, and settle once stimulation begins.

Also known as: downreg, pituitary suppression

Sources

  • Royal Australian and New Zealand College of Obstetricians and Gynaecologists (ranzcog.edu.au)

Last reviewed: 10 September 2026. Written by the Antega Editorial Team. General information only โ€” always follow the advice of your own clinic, doctor or pharmacist.

Explore in-depth guides

Learn more with Antega's fertility guides and articles.