Polydrug self‐administration in ratsCocaine‐heroin is more rewarding than cocaine‐ alone
作者:
Robert Ranaldi,
Elizabeth Munn,
期刊:
NeuroReport
(OVID Available online 1998)
卷期:
Volume 9,
issue 11
页码: 2463-2466
ISSN:0959-4965
年代: 1998
出版商: OVID
关键词: Breaking point;Cocaine;Heroin;Polydrug;Progressive ratio;Rats, Reinforcement;Reward;Self-administration;Speedballs
数据来源: OVID
摘要:
THE i.v. self-administration by rats of a polydrug combination of cocaine and heroin was explored. The rewarding efficacies of a range of cocaine doses (0.25–8 mg/kg/ injection) alone or in combination with heroin (12.5 or 25 μg/kg/injection) were compared using a progressive ratio (PR) schedule of reinforcement. Breaking points (BP) for one group of rats were determined at each dose of cocaine alone and for two other groups at each of the same cocaine doses plus one of the heroin doses, respectively. The cocaine-heroin combination was associated with higher BPs than cocaine alone at all doses of cocaine. These data demonstrate that cocaine-heroin combinations (speedballs) are more rewarding than the identical doses of cocaine alone. Some possible mechanisms by which heroin increases cocaine reward are discussed.
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