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Craving espresso: the dialetics in classifying caffeine as an abuse drug

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Abstract

Caffeine is the most consumed psychoactive substance in the world; in general, it is not associated to potentially harmful effects. Nevertheless, few studies were performed attempting to investigate the caffeine addiction. The present review was mainly aimed to answer the following question: is caffeine an abuse drug? To adress this point, the effects of caffeine in preclinical and clinical studies were summarized and critically analyzed taking account the abuse disorders described in the Diagnostic and Statistical Manual of Mental Disorders (DSM-V). We concluded that the diagnostic criteria evidenced on DSM-V to intoxication-continued use and abstinence are not well supported by clinical studies. The fact that diagnostic criteria is not widely supported by preclinical or clinical studies may be due specially to a controversy in its exactly mechanism of action: recent literature point to an indirect, rather than direct modulation of dopamine receptors, and auto-limitant consumption due to adverse sensations in high doses. On the other hand, it reports clear withdrawal-related symptoms. Thus, based on a classical action on reward system, caffeine only partially fits its mechanism of action as an abuse drug, especially because previous research does not report a clear effect of dopaminergic activity enhance on nucleus accumbens; despite this, there are reports concerning dopaminergic modulation by caffeine on the striatum. However, based on human and animal research, caffeine withdrawal evokes signals and symptoms, which are relevant enough to include this substance among the drugs of abuse.

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Acknowledgements

We are grateful to CNPQ, for providing financial support to this work CNPQ-FAPESP–465458/2014-9 and 2014/50891-1-INCT Translacional em Medicina (465458/2014-9).

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VSR and BLS conceived the general structure of the article and selection methods. LSR and MKFS performed literature search and paper selection. MKFS, BLS, and ECG wrote the manuscript. VG, BLS, and ECG revised the manuscript for submission and the responses to reviewers. All authors read and approved the manuscript.

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Correspondence to Bruno Lobão-Soares.

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The authors declare that they have no conflict of interest.

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dos Santos, M.K.F., Gavioli, E.C., Rosa, L.S. et al. Craving espresso: the dialetics in classifying caffeine as an abuse drug. Naunyn-Schmiedeberg's Arch Pharmacol 391, 1301–1318 (2018). https://doi.org/10.1007/s00210-018-1570-9

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  • DOI: https://doi.org/10.1007/s00210-018-1570-9

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