2‐Fluorodeschloroketamine (2‐FDCK) as a substitute for ketamine has emerged among drug abusers in recent years. However, 2‐FDCK has not been controlled or regulated in many countries, which may be partly related to the lack of evidence on its abuse potential. In this study, we evaluated the abuse potential of 2‐FDCK via the tests of the conditioned place preference (CPP), locomotor sensitization, drug self‐administration and drug discrimination using ketamine as a reference. 2‐FDCK induced significant CPP at a minimum dose of 3 mg/kg in mice, an effect comparable with that of ketamine (3 mg/kg). Acute injections of 2‐FDCK or ketamine at 30 mg/kg enhanced locomotor activity. Repeated treatments with this dose of 2‐FDCK and ketamine induced locomotor sensitization after withdrawal. 2‐FDCK readily induced self‐administration with 0.5 mg/kg/infusion, the same dose for ketamine, and induced the highest seeking response at 1 mg/kg. Drug discrimination test showed that 2‐FDCK dose‐dependently substitute for ketamine with comparable ED50 to ketamine in substitution testing. Taken together, these results strongly suggested that 2‐FDCK has an abuse potential comparable with ketamine.
Carfentanil, as a fentanyl analogue, is a potent synthetic opioid. It has been controlled in many countries, and its emergence has been highlighted by many recent reports.However, although discriminative stimulus effects of carfentanil in rats had been reported, its abuse potential has not been fully evaluated. In this study, we evaluated the abuse potential of carfentanil via the tests of conditioned place preference (CPP), drug self-administration and naloxone-precipitated opioid withdrawal assay, com-
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