Aim and Background: Different types of drugs are used as pharmacologic prophylaxis for migraineheadache. Each of them has its own efficacy and side effects. In addition to pharmacological drugs, somestudies have also suggested the use of the alternate and herbal remedy in migraine. Peppermint has a longhistory of use in some disorders, including headache. In this study we evaluate the effectiveness of oralpeppermint extract (menthol) in migraine.Materials and methods: This study is a randomized clinical trial held in Sadaf pain clinic, Pars Hospitaland Amir-al-momenin Hospital in Tehran. In this study 40 patients, aged between 18 to 65 years with 2 to 8attacks per month who were on prophylactic treatment, have been observed for one month. Oral menthol 2%was also added for 1 month to their usual treatment (5 drops after lunch and dinner). Patients were followedfor frequency of attacks, headache severity, and duration of attacks and associated symptoms of attacks, onemonth before and one month after consumption of the peppermint extracts.Findings: Peppermint caused a significant decrease in frequency, severity and duration of attacks (P-value<0.05). Among symptoms, photophobia and phono-phobia were improved significantly (P-value<0.05), whereas no significant change was observed in nausea and vomiting (P-value>0.05).Conclusion: Our study showed that peppermint extract (menthol) could significantly reduce the intensity, duration and frequency of migraine attacks in combination with prophylactic pharmacologic therapy.