<qa>  What is the name of the study drug that the subject will be given?The subject may or may not be asked to return the next day for a third treatment day depending on the study physicians review of their response to study treatment. If it is determined that the subject does not need to return for a third treatment day, a blood sample will be obtained from a vein in their arm. The subject will also be given a take home supply of the oral study drug Depakote ER with instructions. The subject will be scheduled to return to the study office in 6 weeks OR when their current cluster cycle ends, whichever comes first. 