IRCT20140111016162N3 IRCT 2020-06-26 Tehran University of Medical Sciences Assessment of nifedipine administration in assisted reproductive technology on the rate of pregnancy Assessment of Nifedipine administration before fetus transfering in IVF on the rate of pregnancy in infertile women 2017-09-11 anticipated 158 Complete https://irct.ir/trial/48235 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: We used balanced block randomization with computer-generated sequence in blocks of 6 to recruit subject in each arm. We used the ratio of 1:1 to allocate subjects in each arm, Blinding description: A randomization list is prepared by the statistician. In this process, randomization control trial medicine was placed in similar packets. The sequence of medicine administration and the list of random allocation were not disclosed to dispensing practitioners. These packets were handed over to the dispensing nurse, who was unaware of the contents of each packet. When the doctor declares the eligibility of patients, the nurse then distributes the packets based on the identification numbering. Fulfillment of the final data is up to the individual who is unaware of the type of treatment. 3 Infertility. Intervention 1: Intervention group: Participants receive oral nifedipine tablets ,20 Mg single dose 30 minutes before embryo transfer. Intervention 2: Control group: no intervention. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is The research team has not yet decided how to publish the IPD