 If the study physician determines that the subject should return for a third treatment day, the subject will return to the study office the day after their second treatment visit. The same infusion procedures will be performed. The study staff will review the subjects diary and record their vital signs. A blood sample 2 teaspoons will be obtained from a vein in their arm. Prior to leaving the office, the research nurse or study physician will give the subject an oral dose of the second study medication, Depakote ER. 