I am going to do ivf in coming month.doctor gave me decapeptil shot daily.what does decapeptil do?

UK?: I assume you are being treated in the uk, that name is not in the U.S. But i believe it is a gnrh antagonist. In ivf it is used to suppress the brain from producing fsh and lh. This allows your doctor to have better control of your stimulation. It also prevents you from ovulating prior to when your eggs are ready for retrieval. It is sometimes used in a flare protocol.