Intervention: Acamprosate
Trial phase: Not Applicable
ATC code: N07BB03
SMILES: CC(=O)NCCCS(=O)(=O)O
Sex: All
Age groups: Adult
Healthy volunteers: Accepts Healthy Volunteers
Participants at risk: 13
Group description: acamprosate tablets
Eligibility criteria:
Inclusion Criteria:

Written informed consent is obtained.
The patient is English-speaking and 18 through 64 years of age inclusive.
The patient meets the DSM-IV criteria for anxiety disorder as determined by the MINI and psychiatric evaluation. These include: Post-Traumatic Stress Disorder (PTSD), General Anxiety Disorder (GAD), Social Anxiety, and Panic Disorder.
The patient is currently taking a monotherapy SSRI for ≥ 6 weeks and on a stable, adequate therapeutic for ≥ 4 weeks and remains anxiety symptomatic
The patient has a total score of at least 16 on the HAM-A scale
The patient has a score of at least 7 on the HADS anxiety subscale score at the screening and baseline visits.
The patient has a CGI-S rating of 4 or higher at screening
The patient is in good health as determined by a medical and psychiatric history, medical examination, and cannot have major medical illness that would jeopardize patient health during the study.
Women must be of nonchildbearing potential [i.e., postmenopausal, be surgically sterile (hysterectomy or tubal ligation)] or must meet all of the following conditions: using a reliable, medically accepted form of contraception for at least 60 days before the baseline visit, and agree to continue such use throughout the duration of the study and for 30 days after the final dose of study drug. Reliable forms of contraception include oral, implanted, or injected contraceptives; intrauterine devices in place for at least 3 months; and adequate barrier methods in conjunction with spermicide (abstinence is considered an acceptable contraceptive regimen). Women must be given a pregnancy test (ßHCG), unless they are at least 2 years postmenopausal or surgically sterile, and the results of the test must be negative.
The patient must be willing and able to comply with study restrictions and to remain at the clinic for the required duration during the study period, and willing to return to the clinic for the follow-up evaluation as specified in this protocol.

Exclusion Criteria:

Patients are excluded from participating in this study if 1 or more of the following criteria are met:

The patient is on more than one antidepressant or takes a standing sedative anxiolytic
The patient has a substance misuse disorder (including alcohol, caffeine, but not nicotine)
The patient is a significant risk of suicide
The patient has recently started psychotherapy or counseling (within last 6 weeks)
The patient has other psychiatric Axis-I disorders as a principal diagnosis (except anxiety) within 6 months of screening and baseline visits; any history of OCD, psychotic disorder, bipolar disorder, or eating disorder, mental retardation, or clear personality disorder. Patient may have a co-morbid substance misuse, depressive or anxiety disorder if it has been in remission for at least 6 months prior to screening visit.
The patient has previously participated in any clinical study with acamprosate or treated with acamprosate.
The patient has used an investigational drug within 1 month before the screening visit or is participating in a concurrent clinical trial.
The patient has any disorder that may interfere with drug absorption, distribution, metabolism, or excretion (including gastrointestinal surgery).
The patient is unlikely to comply with the study protocol, be unreliable in providing ratings, or is unsuitable for any reason, as judged by the investigator.