Psychopharmacology

, Volume 225, Issue 3, pp 637–646

Self-administration of gamma-hydroxybutyric acid (GHB) precursors gamma-butyrolactone (GBL) and 1,4-butanediol (1,4-BD) in baboons

  • Amy K. Goodwin
  • Barbara J. Kaminski
  • Elise M. Weerts
Original Investigation

Abstract

Rationale

Gamma-butyrolactone (GBL) and 1,4-butanediol (1,4-BD) are gamma-hydroxybutyrate (GHB) pro-drugs and drugs of abuse.

Objective

Given the reports of abuse, and the ease at which GBL and 1,4-BD may be obtained, we investigated the reinforcing effects of GBL (n = 5) and 1,4-BD (n = 4) in baboons using IV self-administration procedures.

Methods

Sessions ran 24 h/day. Each injection was contingent upon completion of a fixed number (120 or 160) of lever responses. A 3-h timeout period followed each injection, limiting the total number of injections to eight per day. Self-administration was first established with cocaine (0.32 mg/kg/injection). GBL (10–130.0 mg/kg/injection), 1,4-BD (10–100 mg/kg/injection), or vehicle was substituted for cocaine for at least 15 days. Food pellets were available ad libitum 24 h/day and were contingent upon completion of ten lever responses.

Results

GBL (32–100 mg/kg/injection) maintained significantly greater numbers of injections when compared to vehicle in four of five baboons, and the mean rates of injection were high (more than six per day) in three baboons and moderate in the fourth baboon (four to six per day). 1,4-BD (78–130 mg/kg/injection) maintained significantly greater numbers of injections when compared to vehicle in only two out of four baboons, and mean rates were moderate to high in both baboons. Self-injection of these doses of GBL and 1,4-BD generally inhibited food-maintained responding.

Conclusions

GBL and 1,4-BD have abuse liability. Given that GBL and 1,4-BD are self-administered, are easier to obtain than GHB, and are detected in seized samples, additional legal control measures of these GHB pro-drugs may be needed.

Keywords

Gamma-hydroxybutyrate Self-administration Abuse liability Zolpidem Cocaine Reinforcement Operant behavior Drug abuse 

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Amy K. Goodwin
    • 1
  • Barbara J. Kaminski
    • 1
  • Elise M. Weerts
    • 1
  1. 1.Department of Psychiatry and Behavioral Sciences, Behavioral Biology Research CenterJohns Hopkins University School of MedicineBaltimoreUSA

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