 The subject will be given a take home supply of the oral study drug Depakote ER with instructions. Subjects will be instructed to take 2000mg of Depakote ER once a day. The subject will be scheduled to return to the study office in 6 weeks OR when their current cluster cycle ends, whichever comes first. The research staff will contact the subject bi-weekly to see how they are doing and to confirm that they are taking your study drug appropriately. The research staff will also ask whether or not the subject had any unusual symptoms, or out of the ordinary experiences since their last contact with the site. The subject will be instructed to call the study site should they have any questions or have any unwanted experiences. 