Effects of terguride, ropinirole, and acetyl-L-carnitine on methamphetamine withdrawal in the rat

Pharmacology, Biochemistry, and Behavior
Michael E HoeferLuigi Pulvirenti

Abstract

Withdrawal from psychostimulants, including methamphetamine, induces a depressive state associated with lethargy, dysphoria, hyperphagia and psychomotor retardation. Previous work with repeated administration of amphetamine in rats has shown that amphetamine withdrawal produces decreased motivation to work for a non-drug reward, and this withdrawal is reversed by administration of a dopamine partial agonist. The purpose of the present study was to examine decreased motivation to work for a non-drug reward during methamphetamine withdrawal and explore the effects of a dopamine agonist, dopamine partial agonist, and indirect monoamine agonist on methamphetamine withdrawal. During withdrawal from repeated methamphetamine administration, rats showed reduced responding for a sweet solution in a progressive-ratio schedule of reinforcement, and this effect was significantly more pronounced than previously observed with amphetamine. Repeated systemic treatment with the dopamine partial agonist terguride (0.2 and 0.4 mg/kg, i.p., twice daily), the full dopamine agonist ropinirole (1 mg/kg, i.p., twice daily), and acetyl-L-carnitine (60 and 100 mg/kg, i.p.), a compound with a potential antidepressant effect, during methamphetamine withdr...Continue Reading

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