Patient Resources

GnRH Antagonist

A synthetic hormone similar to GnRH agonists but without any initial “flare” effect on the pituitary as seen with GnRH agonists. Antagonists (Ganirelix or Cetrotide) are usually administered in IVF cycles during the last 3-4 days of stimulation to prevent an LH surge from occurring, thereby preventing the release of the eggs from the ovaries prior to egg retrieval. 

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