Hormones
Progesterone converts the endometrium into a receptive state and sustains early pregnancy until the placenta takes over. In IVF and frozen transfer cycles it is supplied as vaginal pessaries or gel, or by injection. Do not stop prescribed progesterone without speaking to your clinic first.
Also known as: progesterone support, P4
Related Canada guides
Sources
- Society of Obstetricians and Gynaecologists of Canada (SOGC) patient information
Last reviewed: September 9, 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.