BACKGROUND:D-cycloserine (DCS), a partial glutamate N-methyl-D-aspartic acid (NMDA) receptor agonist, enhances extinction of conditioned fear responding in rodents and facilitates exposure-based learning in humans with anxiety disorders. OBJECTIVES: This preliminary study investigates DCS pretreatment on response to cocaine cues in cocaine-dependent subjects. METHODS:Ten cocaine-dependent subjects were randomly assigned to receive either 50 mg DCS or matching placebo two hours before each of two 1-hour cocaine cue exposure sessions one day apart. HR and craving ratings were obtained before and during cue exposure sessions. RESULTS: There was a trend towards increased craving to cocaine cues in cocaine-dependent individuals after administration of DCS. CONCLUSIONS: The administration of DCS prior to cue exposure sessions may facilitate response activation. SCIENTIFIC SIGNIFICANCE: While facilitation of extinction-based learning by DCS may have therapeutic potential for cocaine dependence, this drug may exhibit a different profile in cocaine-dependent individuals as compared to those with anxiety disorders.
RCT Entities:
BACKGROUND:D-cycloserine (DCS), a partial glutamate N-methyl-D-aspartic acid (NMDA) receptor agonist, enhances extinction of conditioned fear responding in rodents and facilitates exposure-based learning in humans with anxiety disorders. OBJECTIVES: This preliminary study investigates DCS pretreatment on response to cocaine cues in cocaine-dependent subjects. METHODS: Ten cocaine-dependent subjects were randomly assigned to receive either 50 mg DCS or matching placebo two hours before each of two 1-hour cocaine cue exposure sessions one day apart. HR and craving ratings were obtained before and during cue exposure sessions. RESULTS: There was a trend towards increased craving to cocaine cues in cocaine-dependent individuals after administration of DCS. CONCLUSIONS: The administration of DCS prior to cue exposure sessions may facilitate response activation. SCIENTIFIC SIGNIFICANCE: While facilitation of extinction-based learning by DCS may have therapeutic potential for cocaine dependence, this drug may exhibit a different profile in cocaine-dependent individuals as compared to those with anxiety disorders.
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