by Dr. Wisot » Tue Feb 21, 2012 11:18 pm
Hi:
Lupron is a agonist. It first stimulates, then suppresses so it needs to be started before the stimulation drugs.
Ganirelix and Cetrotide are antagonists. They suppress immediately so the stimulation can be started first, the response begins and then they are started before the LH surge starts and prevent the LH surge.
Arthur L. Wisot, M. D.
Reproductive Partners Medical Group, Inc.
Redondo Beach, California