Efficacy and Safety Study of E2007 in Migraine Prophylaxis

Inclusion Criteria

• Patients of any race, 18 to 65 years of age inclusive.
• Patients with a history of migraine (with or without aura) according to the Headache Classification Committee of the IHS. Migraine attacks have to have had an onset before age 50 and have to have been present for at least 12 months.
• Patients with 4-12 qualified migraine attacks per month over the past three months prior to Screening, as well as during the four weeks of the Baseline Phase will be eligible for entry into this study. The interval between two qualified migraine attacks should be at least 24 hours to be counted as distinct migraine attacks. A qualified migraine attack without aura is defined as a headache that lasts 4-72 hours (if untreated or unsuccessfully treated) or if successfully treated (revised per Amendment 01). This attack has at least two of the following characteristics: unilateral location, pulsating quality, moderate or severe intensity that inhibits or prohibits daily activities or aggravation by routine physical activities such as walking up stairs. In addition, at least one of the following symptoms must be present during the headache: nausea, vomiting, or photophobia and phonophobia (revised per Amendments 01 and 02). A qualified migraine attack with aura must fulfill the same criteria as the headache attack, plus have an associated aura as defined by the Migraine Criteria of the Headache Classification Committee of the International Headache Society. An aura alone that requires acute migraine treatment will also be considered a migraine attack.
• Male and female patients will be eligible for enrollment. Females should be either of non-childbearing potential by reason of surgery, radiation, menopause (one year post onset), or of childbearing potential and practicing a medically acceptable method of contraception (eg, abstinence, a barrier method plus spermicide, or IUD) for at least one month before study randomization and for two months after the end of the study, and have a negative serum B-hCG at Screening. Pregnant and/or lactating females are excluded. Those women using hormonal contraceptives must also be using an additional approved method of contraception (eg, a barrier method plus spermicide, or IUD) starting with the Baseline Phase and continuing throughout the entire study period.
• Patients with a Body Mass Index (BMI) between 19 to 40 kg/m2 inclusive at Screening.
• Patients who are willing to participate and have provided written informed consent prior to being exposed to any study-related procedures.

Exclusion Criteria

• Patients with chronic daily headaches as defined by more than 14 headache days per month on average during the three months prior to Screening,
• Patients with cluster headaches and other trigeminal autonomic cephalalgias, and other primary headaches (except tension-type headache) and secondary headaches (defined according to the Headache Classification Committee of the IHS 2004),
• Patients with a history of being non-responsive to more than two classes of adequately conducted, prophylactic migraine treatments (e.g., beta blockers, calcium channel blockers, tricyclics, MAOIs, valproate (divalproex), topiramate, gabapentin),
• Patients who use the following medications as described:
• Use of marketed triptans for 10 days or greater per month on average,
• Use of ergot-containing medications for ten days or greater per month on average,
• Use of NSAIDs, acetaminophen, or isometheptene-containing agents for 15 days or greater per month on average,
• Use of opioids for 10 days or greater per month on average,
• Use of any two or more of the above medications for 15 days or greater per month on average,
• Patients with clinically significant neurological illness, other than migraine, that, in the opinion of the Investigators, may have the potential of altering pain perception or reporting,
• Patients with a history of or currently having major psychiatric disorders includin