Distinct effects of cocaine and cocaine plus cannabis on neurocognitive functioning and abstinence: A six-month follow-up study

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Citações na Scopus
5
Tipo de produção
article
Data de publicação
2019
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ISSN da Revista
Título do Volume
Editora
ELSEVIER IRELAND LTD
Citação
DRUG AND ALCOHOL DEPENDENCE, v.205, article ID UNSP 107642, 8p, 2019
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
Background and Aims: Cannabis use is frequent among individuals with cocaine use disorder. Despite recent non-controlled studies advocating a therapeutic role of smoked cannabis, there is a paucity of evidence-based data on potential therapeutic and cognitive side-effects of this association. Methods: We examined 63 cocaine-addicted subjects who used cannabis more than 50 times in lifetime (COC + CAN), 24 cocaine-addicted patients who use cannabis less than 50 times (COC), and 36 controls (CON). Participants were evaluated with an extensive battery of neurocognitive tests after two weeks of supervised detoxification in an inpatient treatment program. Patients were followed up in one, three, and six months after discharge. Results: Both groups of patients performed worse than CON on working memory, processing speed, inhibitory control, mental flexibility, and decision making. COC + CAN performed worse than COC on speed processing, inhibitory control and sustained attention, while COC performed worse than COC + CAN on mental flexibility. Concomitant cannabis use did not decrease relapses to cocaine use after one, three and six months. Among COC + CAN, earlier cocaine and cannabis use, and impaired executive functioning were predictive of relapse on cocaine after six months. Conclusion: Our results did not support the recommendation of smoked cannabis as a safe therapeutic approach for cocaine-addicted patients due to significant negative cognitive side-effects and absence of efficacy. Further studies investigating frontal brain morphology, neuromaturation, and prescription of the non-psychoactive constituent of cannabis sativa cannabidiol among cocaine-addicted patients who use cannabis are warranted.
Palavras-chave
Cocaine, Cannabis, Polydrug, Cognition, Executive functions
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