Frovatriptan as a Transitional Therapy in Medication Overuse Headache

Inclusion Criteria: * MOH diagnosed by IHS criteria * Diagnosis of migraine (with or without aura) in past by IHS criteria * If patients do not have a baseline diary, then a prospective diary for a 10-day period will be done to confirm medication overuse before study entry. * Patients aged 18 to 65 years. * Normal neurological examination. * Patient is willing and able (in terms of capacity) to sign informed consent. * Patient is able to understand and complete study protocol, including completion of headache diaries. * Patient has a stable medical condition. Exclusion Criteria: * Headache not meeting IHS criteria for MOH. * Presence of hemiplegic, basilar, ophthalmoplegic migraine or migrainous infarction. * Findings on history, neurological exam, or neuroimaging suggestive of secondary causes of headache. * Post-whiplash or post-traumatic headaches. * Contraindications to triptans (such as heart disease, peripheral vascular disease or uncontrolled hypertension) or previous serious side effects/intolerance. * Major psychiatric conditions (such as major depression, bipolar disorder, schizophrenia, addiction), either diagnosed by a physician or positive on standard clinic assessment tools (e.g. BDI questionnaire). * Major medical conditions or treatments that may interfere with the patient's ability to participate in the study, such as dementia, advanced or terminal cancer, chemotherapy, etc. * Patient is pregnant, breastfeeding, or is expecting to conceive within the time period of the study. Pregnancy will be determined using a urine test. * Women of childbearing potential who are not using a reliable method of contraception. * Patient is a recent user of illicit/recreational drugs or plans to use illicit drugs during the study time period. * Patient has a recent history of alcohol abuse or dependence, or plans to abuse alcohol during the study duration. * Patient is unlikely to comply with the study protocol, keep diaries and appointments, or does not have a fixed telephone or address. * Patient is enrolled in another study or trial that may interfere with their participation or the results of this study. * Patients with greater than 30% of their data missing during the ten days of baseline diary data collection. * Patients with mean headache intensities of less than 3 (from a pain scale of 0 to 10, where 0=no pain and 10=pain as bad as possible) during the 10-day baseline period. * Patients with ongoing Botox treatments or those who have received Botox in the last 4 months.