Tehran University of Medical Sciences Journal of Family and Reproductive Health 1735-8949 10 1 2016 05 15 35 41 EN Shamim Pilehvari Reproductive Health Research Center, Tehran University of Medical Sciences, Tehran, Iran Ensieh Shahrokh Tehraninejad Reproductive Health Research Center, Tehran University of Medical Sciences, Tehran, Iran Batool Hosseinrashidi Reproductive Health Research Center, Tehran University of Medical Sciences, Tehran, Iran Fatemeh Keikhah Reproductive Health Research Center, Tehran University of Medical Sciences, Tehran, Iran Fedyeh Haghollahi Reproductive Health Research Center, Tehran University of Medical Sciences, Tehran, Iran Elham Aziminekoo Reproductive Health Research Center, Tehran University of Medical Sciences, Tehran, Iran 2016 01 04 2016 03 15 Objective: To compare the pregnancy outcomes achieved by in vitro fertilization (IVF) between minimal stimulation and conventional antagonist protocols in poor ovarian responders (PORs). Materials and methods: In this randomized controlled trial, 77 PORs undergoing IVF were selected and divided into two groups. First group was the minimal stimulation group (n = 42) receiving 100 mg/day clomiphene citrate on day 2of the cycle for 5 day that was followed by150IU/day human menopausal gonadotropin (hMG) on day 5 of the cycle. Second group was the conventional group (n = 35) receiving at least 300 IU/daygonadotropin on day 2 of the cycle. Gonadotropin-releasing hormone (GnRH) antagonist protocol was applied for both groups according to flexible protocol. Number of retrieved oocytes and chemical pregnancy rate were the main outcomes. Results: There was no difference in number ofretrieved oocyte and pregnancy rate (2.79 ± 1.96 vs. 2.20 ± 1.71 and 5.6% vs. 4.1%; p > 0.05) between both groups. The gonadotropin dose used in the minimal stimulation group was lower than conventional group (1046 ± 596 vs. 2806 ± 583). Conclusion: Minimal stimulation protocol with lower gonadotropin used is likely to be considered as a patient- friendly and cost-effective substitute for PORs.   https://jfrh.tums.ac.ir/index.php/jfrh/article/view/373 https://jfrh.tums.ac.ir/index.php/jfrh/article/download/373/347