IRCT20190609043845N1 IRCT 2019-06-20 Guilan University of Medical Sciences Effect of reduced dose of long-acting GnRH agonist versus short acting GnRH agonist Evaluation of the effect of reduced dose of long-acting gonadotropin releasing hormone (GnRH) agonist versus short acting GnRH agonist on pregnancy outcome in patients undergoing intracytoplasmic sperm injection outcome- clinical trial 2019-07-29 anticipated 400 Complete https://irct.ir/trial/40173 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Block randomization will be done with a 4:4 allocation ratio.(https://www.sealedenvelope.com), Blinding description: Each patient will have an identification code (IC) which will be placed in sealed envelope by researcher. Also, medications will be placed in sealed containers with IC. The physicians and patients will be blinded to group assignment. 3 Infertility. Intervention 1: Intervention group: long-acting gonadotropin releasing hormone (GnRH) agonist: Decapeptyl (1.25mg, Ferring) will be injected on 21st day of menstruation before the start of ovarian induction cycle. Intervention 2: Intervention group: short-acting gonadotropin releasing hormone (GnRH) agonist: Cinnafact (Cinnagen) will be injected on 21st day of previous menstrual cycle at starting dose of 0.5 mg/daily and continued 0.25 mg/daily from 2st day of menstruation until the day of hCG administration. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is no further information