IRCT20160308026971N4 IRCT 2018-06-10 Rafsanjan University of Medical Sciences Investigation the Effect of vaginal Evening Primrose capsule on cervical preparation for childbirth Investigation the Effect of vaginal Evening Primrose capsule on cervix preparation in nulliparous Women 2017-09-23 anticipated 86 Complete https://irct.ir/trial/22232 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: The method of randpm allocation in this study is simple randomization and its tool is a random number table. At first, the researcher referred to the public health centers of Rafsanjan (Nos. 1, 4, and 5). She chose all the eligible pregnant women in the apple system and, after telephone conversation with each of the women, explained the research, if Their willingness to participate in the study, each of them assigned a number, and then the random numbers table is used to select the members of the intervention and control group, Blinding description: In this study, the research units and the clinical caregiver are unaware of any sample in which of the control and intervention groups. 3 Bishop Score. Intervention 1: The drug used in this study is soft Barich EPO capsule or Evening Primrose Oil capsule produced by Barich Essence Company. Each soft capsule contains 1000 mg of Evening Primrose Oil and 140-70 mg gamma linolenic acid (GLA). Each study unit in the intervention group is given 21 units. From the beginning of the 38th week of gestation until the day of delivery, one capsule of Evening Primrose Oil embeds in the posterior fornix. Intervention 2: Twenty-one placebos are presented to the control group in the same way as Evening Primrose Oil capsule, manufactured by the Barich Essence pharmaceutical company, From the beginning of the 38th week of gestation until the day of delivery, one placebo of Evening Primrose capsule embeds in the posterior fornix. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is not more information