Topiramate Treatment of Alcohol Use Disorders in Veterans With Post Traumatic Stress Disorder (PTSD): A Pilot Controlled Trial of Augmentation Therapy

The goal of the proposed project is to improve the treatment of veterans with co-occurring Post Traumatic Stress Disorder (PTSD) and alcohol dependence. Exposure to the stresses of combat is known to be associated with risk for both PTSD and alcohol and other substance use. PTSD and alcohol use disorders occur frequently among returning OEF/OIF veterans. Alcohol and substance use are risk factors for the development of PTSD, moderators of PTSD symptom severity, and potential consequences of PTSD. Alcohol is by far the most common substance of abuse in patients with PTSD, and its use may represent an attempt by PTSD patients to "self-medicate" symptoms such as hyperarousal. However, to date there has been little research to develop pharmacotherapies that would, ideally, reduce both alcohol use and PTSD symptoms.

Topiramate is one of the few medications for alcohol dependence that has also been tested as a potential medication to treat PTSD. Topiramate's efficacy in alcohol dependence has been shown in two recent large controlled trials. Several open trials have suggested that topiramate may be effective in reducing PTSD symptoms while the results of two small controlled trials have been mixed.

A clinical trial of topiramate is therefore indicated in order to achieve the following specific aims:

The primary aim is to obtain a preliminary assessment of the efficacy of topiramate in increasing the percent of days abstinent from alcohol use from baseline to the end of treatment in veterans with PTSD and alcohol abuse/dependence who are drinking heavily.

The secondary aim is to obtain a preliminary assessment of the efficacy of topiramate in increasing the percent of days abstinent from alcohol as compared to placebo.

Additional aims include the following:

• To obtain a preliminary assessment of the efficacy of topiramate in reducing other measures of alcohol use such as percent heavy drinking days, number of drinks per week, number of drinks per drinking day, and alcohol craving.
• To obtain a preliminary assessment of the efficacy of topiramate in reducing PTSD symptom severity in veterans with chronic PTSD and alcohol abuse/dependence.
• Informing the design of a planned subsequent larger controlled trial of topiramate in veterans with chronic PTSD and alcohol abuse/dependence
• To obtain an estimate of topiramate vs. placebo effect size for future studies. B. To obtain a preliminary assessment of the effects of topiramate treatment on measures of risk-taking behavior in veterans with chronic PTSD and alcohol abuse/dependence.

To achieve these aims, we will conduct a prospective, parallel groups, randomized, double-blind, placebo-controlled flexible-dose pilot clinical trial of topiramate in veterans with PTSD and alcohol abuse/dependence who are already receiving standard treatment for PTSD but still drink heavily. The primary treatment outcome will be percent days abstinent from alcohol; secondary outcomes will include other alcohol use measures, PTSD symptom severity, adverse effects, recruitment and retention rates.

Inclusion criteria

• Male and female outpatient veterans.
• Current DSM-IV diagnosis of PTSD.
• Current (past month) DSM-IV diagnosis of an Alcohol Use Disorder.
• Must meet criteria for "heavy" or "at-risk" drinking by NIAAA thresholds.
• Receiving treatment for PTSD.
• Must express desire to reduce alcohol consumption.
• Female subjects must have negative urine pregnancy test and must be either postmenopausal for at least one year, or practicing an effective method of birth control.
• Must have a BAC of less than 0.02% when signing the informed consent.

Exclusion criteria

• Psychotic disorders, bipolar disorder, dementia, or other psychiatric disorders judged to be unstable.
• Subjects known to have clinically significant unstable medical conditions, including but not limited to: clinically significant renal disease and/or impaired renal function as defined by clinically significant elevation of BUN or creatinine or an estimated creatinine clearance of < 60 mL/min; AST (SGOT) and/or ALT (SGPT) >3 times the upper limit of the normal range and/or an increased serum bilirubin >2 times the upper limit of normal; seizure disorders.
• Subjects with glaucoma.
• Subjects with a history of kidney stones.
• Subjects with a history of renal disease.
• Concurrent participation in another treatment study.
• Female patients who are pregnant or lactating.
• Current topiramate use or use within the past 4 weeks.
• Current medications for alcohol dependence or use within the past 4 weeks.
• Needing acute medical detoxification from alcohol based on a score of 12 or more on the Clinical Institute Withdrawal Assessment of Alcohol Scale (CIWA-AD);
• Subjects who are legally mandated to participate in an alcohol treatment program.
• Subjects who have had a suicide attempt or suicidal ideation in the 6 months prior to enrollment.
• Subjects who have previously been treated with topiramate for any reason and discontinued treatment due to an adverse event or due to a hypersensitivity reaction to topiramate,
• Subjects with seizure disorders that require anticonvulsant medications
• Subjects currently being treated with another anticonvulsant.
• Subjects who in the opinion of the investigator should not be enrolled in the study because of the precautions,warnings or contraindications outlined in the topiramate package insert.