Vortioxetine for Posttraumatic Stress Disorder

Inclusion 1. Males and Females between the ages of 18 and 65 2. Fulfills Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) criteria for primary diagnosis of PTSD. 3. Able to give consent 4. Willingness to sign the treatment contract 5. A negative urine toxicology 6. For females of reproductive age, use of an effective birth control method\* for the duration of the study or abstinence. 7. Duration of illness of PTSD for at least 3 months 8. An initial score at Screening, and Visit 3 (randomization) of ≥ 50 on the Clinician Administered PTSD Scale (CAPS) for PTSD Studies Exclusion 1. Lifetime or current diagnosis of schizophrenia or other psychotic disorder, dementia, bipolar disorder. 2. Subject is currently participating in another clinical trial in which s/he is or will be exposed to an investigational or non-investigational drug or device, or has done so within the preceding month. 3. Current evidence or history of significant unstable medical illness or organic brain impairment, including stroke, Central Nervous System (CNS) tumor, demyelinating disease, cardiac, pulmonary, gastrointestinal, renal or hepatic impairment that would likely interfere with the action, absorption, distribution, metabolism, or excretion of Vortioxetine. History of moderate or more severe Traumatic Brain Injury (TBI) will also be exclusionary. 4. Patients who in the investigator's judgment pose a current suicidal or homicidal risk 5. DSM-5 substance abuse or dependence within the past 90 days. Subject has a positive urine toxicology test for illegal substances. 6. Diagnosis of anorexia nervosa, bulimia, or Obsessive Compulsive Disorder (OCD) in the past year. 7. Subject has a documented history of hepato-biliary disease including a history of, or positive laboratory results for hepatitis (hepatitis B surface antigen and/or hepatitis C antibody), and clinically significant hepatic enzyme elevation, including any one of the following enzymes greater than 3 times the upper limit of normal (ULN) value (Alanine transaminase (ALT), aspartate aminotransferase (AST), alkaline phosphatase( ALP)), or total or direct bilirubin \> 1.5 x ULN, unless consistent with presumed or diagnosed Gilbert's disease 8. Subject has taken systemic corticosteroids within 2 weeks of the Randomization Visit 9. Treatment with any other psychoactive medication within 2 weeks of Visit 1, including all antidepressants, psychoactive herbal or nutritional treatment (St Johns Wort,S-Adenosyl methionine(SAM-e)), lithium, other mood stabilizers, oral antipsychotics, depot antipsychotics within 12 weeks, beta blockers, thioridazine, pimozide, opiates, anxiolytics, and sedatives (with the exception of zolpidem, eszopiclone, and zaleplon). Also any treatment with any medication that the PI judges not acceptable for this study. 10. Pregnancy or lactation\* 11. Subjects who, in the opinion of the investigator, would be noncompliant with the visit schedule or study procedures (e.g. illiteracy, planned vacations, or planned hospitalizations during the study). 12. Any laboratory abnormality that in the investigator's judgment is considered to be clinically significant 13. Patients who are receiving exposure-based psychotherapy that targets PTSD symptoms 14. Current or planned litigation or other actions related to secondary gain regarding the traumatic event 15. Subject has clinical evidence of, or ElectroCardiogram (ECG) results indicating any of the following at either screen or Randomization Visit unless repeat ECG shows that the parameter had returned to within normal range by the Randomization Visit: * Q to T interval change (QTc)\> 450 msec for men, or \> 475 msec for women; * any cardiac condition or ECG evidence that the investigator feels may pose a potential safety concern.