Ketamine Infusion Therapy for PTSD in Combat Veterans

Inclusion Criteria: * The Veteran must be medically screened by Klarisana and be an appropriate candidate for ketamine therapy * The Veteran must be between the ages of 18 and 75. The study is open to men and women. * The Veteran must be able to speak and read the English language * The Veteran must have a diagnosis of post-traumatic stress disorder assigned by the Department of Veterans Affairs. Veterans of a foreign military are also eligible but they must have been diagnosed with PTSD by the equivalent veteran healthcare organization in their country of military service * The Veteran must have served in the US Military or a foreign military service in a designated combat zone. Documentation by a DD214 or equivalent is required * The PTSD that The Veteran is suffering from has to have been caused by service in combat * The PTSD that the Veteran is suffering from must be exerting a significant negative effect on his/her life Exclusion Criteria: * The Veteran must NOT be taking lamotrigine (Lamictal) or any monoamine oxidase inhibitor antidepressants * The Veteran must not be currently enrolled in any other studies offering therapy for PTSD * Veteran may NOT have uncontrolled blood pressure or congestive heart failure * Veteran may NOT have a diagnosis of psychosis or any diagnosis on the psychosis spectrum