Abstract:
IMPORTANCE:Cocaine dependence is a significant public health problem, yet no validated pharmacological treatment exists. The potent γ-aminobutyric acid (GABA)ergic medication vigabatrin has previously been shown to be effective in a double-blind single-site study conducted in Mexico. OBJECTIVE:To evaluate the safety and efficacy of vigabatrin for the treatment of cocaine dependence in a U.S. sample. DESIGN AND SETTING:Multisite, randomized, double-blind, placebo-controlled, 12-week clinical trial with follow-up visits at weeks 13, 16, 20, and 24 in 11 U.S. sites. PARTICIPANTS:In total, 186 treatment-seeking participants with cocaine dependence (mean age, 45 years). Approximately 67% were male, and about 60% were of African American race/ethnicity. INTERVENTIONS:Participants received twice-daily doses of vigabatrin (total dosage, 3.0 g/d) or matched placebo, plus weekly computerized cognitive behavioral therapy and biweekly individual counseling for 13 weeks. Contingency management encouraged the provision of urine samples. MAIN OUTCOMES AND MEASURES:The primary outcome measure was the proportion of participants with cocaine abstinence during the last 2 weeks of the 12-week treatment phase as assessed by self-reports and quantitative urine drug screens. The weekly fraction of cocaine use days and the number of drug-free urine samples during weeks 1 through 13 were key secondary measures. RESULTS:No significant differences were observed between the vigabatrin group and the placebo group on the primary outcome measure (P = .67), key secondary measures (P > .99), or other outcome measures. However, while pill counts and self-reports indicated that more than 66% of all participants (and >63% of the vigabatrin group) took more than 70% of their medication, post hoc vigabatrin urine concentration levels suggested that approximately 40% to 60% of patients taking vigabatrin may not have been adherent. This lack of adherence may have obscured any evidence of vigabatrin efficacy. No visual acuity or visual field deterioration occurred in any of the participants. CONCLUSIONS AND RELEVANCE:No protocol-defined differences in efficacy between vigabatrin treatment and placebo were detected for any outcome variable. This may have been due to medication nonadherence or, alternatively, due to the weak efficacy of vigabatrin. TRIAL REGISTRATION:clinicaltrials.gov Identifier: NCT00611130.
journal_name
JAMA Psychiatryjournal_title
JAMA psychiatryauthors
Somoza EC,Winship D,Gorodetzky CW,Lewis D,Ciraulo DA,Galloway GP,Segal SD,Sheehan M,Roache JD,Bickel WK,Jasinski D,Watson DW,Miller SR,Somoza P,Winhusen Tdoi
10.1001/jamapsychiatry.2013.872subject
Has Abstractpub_date
2013-06-01 00:00:00pages
630-7issue
6eissn
2168-622Xissn
2168-6238pii
1677927journal_volume
70pub_type
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