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Treatment and Early Intervention Branch, Addiction Research Center, National Institute on Drug Abuse, Baltimore, Maryland.
Both clinical experience and epidemiological studies in community and specialized (e.g., treatment) populations indicate that the prevalence of co-use of alcohol and cocaine, and the comorbidity of alcoholism and cocaine addiction, are greater than would be expected from the chance occurrence of two independent conditions. Alcohol and cocaine have pharmacokinetic and pharmacodynamic interactions that may account for some of this co-use. While their reinforcing properties have neuropharmacological and behavioral differences, a unified theory of reinforcement by alcohol and cocaine has been proposed, involving dopamine activity in the ventral tegmental area-nucleus accumbens circuit. Regardless of their pharmacology, the prevalent co-use of alcohol and cocaine has important implications for drug abuse treatment and indicates the need for future research on this topic.
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