IRCT138706091132N1 IRCT 2008-12-25 Research and Clinical Center for Infertility, Yazd Shahid Sadoughi University of Medical Sciences Comparison of coasting with cabergoline administration for prevention of early severe Ovarian Hyper Stimulation Syndrome in Assisted Reproductive Technology cycles Comparison of coasting with cabergoline administration for prevention of early severe Ovarian Hyper Stimulation Syndrome in Assisted Reproductive Technology cycles 2006-07-01 anticipated 60 Complete https://irct.ir/trial/170 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention. 2 Ovarian Hyperstimulation Syndrome. Intervention 1: In coasting group, exogenous gonadotropins will be withheld to allow E2 to decrease while GnRH-a will be maintained. Then 10,000 Unit hCG will be administrated and oocyte retrieval will be performed 36 hours later. Luteal phase will be supported by administration of progesterone in oil 100mg per day for 14 days. Intervention 2: In Cabergoline group, hCG will be administered and they receive 0.5 mg per day cabergoline orally from the day of hCG for 8 days. Luteal phase will be supported by administration of progesterone in oil 100mg per day for 14 days.