Abstract

Rotational behaviour (turning) was induced in morphine-dependent rats during precipitated abstinence after acute pretreatment with Δ 8- or Δ 9-tetrahydrocannabinol. This tetrahydro-cannabinol-stimulated turning varied with degree of morphine dependence and was blocked by haloperidol, but not promethazine. Significant attenuation of naloxone-induced abstinence signs was also observed after acute tetrahydrocannabinol pretreatment, but only in highly (72 hr) morphine-dependent rats. The combination of tetrahydrocannabinol and haloperidol pretreatment was more effective in attenuating abstinence than was either haloperidol or tetrahydrocannabinol pretreatment alone. These data provide additional evidence for the alteration of CNS dopaminergic function in morphine dependence.

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