IRCT20180123038486N1 IRCT 2018-11-01 Shahre-kord University of Medical Sciences willow bark and dysmenorrhea Effect of willow bark on primary dysmenorrhea in female students 2015-01-10 anticipated 110 Complete https://irct.ir/trial/29147 interventional Randomization: Randomized, Blinding: Triple blinded, Placebo: Used, Assignment: Crossover, Purpose: Treatment, Other design features: No, Randomization description: Students were randomly allocated into either treatment using randomized block design in the two next consecutive cycles, Blinding description: The capsules of Willow bark extract were produced with the same appearance, color and odor as Mefenamic acid capsules. 3 primary dysmenorrhea. Intervention 1: Intervention group:received willow bark extract capsule (240 mg salicin ) with Placebo three times daily, produced by Medical Plants Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran. The treatments were administered to the students for 1 h after experiencing dysmenorrhea until pain relief, for 4 cycles. Intervention 2: Control group: control group: received Mefenamic acid capsule 250mg, three times daily,produced by Razak pharmaceutical company of Iran , 1 h after experiencing dysmenorrhea until pain relief, for 4 cycles. No - There is not a plan to make this available Justification or reason for not sharing IPD is No more information