Aims: Among all types of headache, migraine is the third most prevalent disorder and seventh common cause of disability. In Old Persian medical literature, Coriander fruit have been introduced as a treatment of headache. The aim of this study was exploring the effect of Coriander fruit on severity and duration of migraine attacks. Materials & Methods: This randomized triple-blind, placebo-controlled clinical trial was conducted in the neurology clinic of Shohadaye Tajrish hospital in Tehran. Based on sample size formula for longitudinal data, a total number of 66 patients were randomly assigned into intervention and control groups. Intervention group received common medicine plus Coriander fruit and the control group received common medicine plus placebo and both were followed during four weeks after intervention. For analyzing the data, random effect and transition models were utilized and the results were compared using Akaike criteria. Findings: The average of attacks duration in the intervention group was 4.27 hours less than the control group (p<0.001). Also, mean severity of migraine attacks in the intervention group was 2.81 (based on VAS scale) less than control group (p<0.001). Conclusion: Coriander fruit reduces the duration and severity of migraine attacks. Also, considering the duration and severity of last migraine attacks is necessary for prediction.