Background
Benzodiazepine (BZD) use disorders are a common clinical problem among methadone maintenance treatment patients and have adverse effects on clinical outcomes.
Objectives
To evaluate gabapentin for the outpatient treatment of BZD abuse or dependence in methadone maintenance patients.
Methods
Participants (n=19) using BZDs at least 4 days per week were enrolled into an eight-week randomized double-blind placebo-controlled outpatient pilot trial. All participants received a manual-guided supportive psychotherapy aimed to promote abstinence. Study medication was titrated over a two-week period to a maximum dose of gabapentin 1200 mg or placebo three times a day. BZD use was assessed using urine toxicology confirmed self-report. BZDs were not provided as part of study participation; participants were provided guidance to gradually reduce BZD intake.
Results
Sixteen participants had post-randomization data for analysis. Retention at week eight was 50%. The mean dose of gabapentin achieved by titration was 2666 mg/day (SD=±1446). There were no significant between group differences on BZD use outcomes (amount BZD per day (Mann-Whitney U = 27, p = .745), abstinent days per week (U = 28, p = .811)) and CIWA-BZD scale (U = 29.0, p = .913). One participant in the gabapentin group discontinued study medication because of peripheral edema. Two participants in the placebo group requested admission for inpatient detoxification treatment.
Conclusion
Gabapentin was not found to differ from placebo, although the small sample recruited for this trial may have limited the ability to detect a difference.