Novel Approaches to the Treatment of Cocaine Addiction

Abstract

Cocaine addiction continues to be an important public health problem with over 1.7 million users in the US alone. Although there are no approved pharmacotherapies for cocaine addiction, a number of medications have been tested with some promising results. In this review, we summarise some of the emerging targets for cocaine pharmacotherapy including dopaminergic and GABA medications, adrenoceptor antagonists, vasodilators and immunotherapies. The brain dopamine system plays a significant role in mediating the rewarding effects of cocaine. Among dopaminergic agents tested for cocaine pharmacotherapy, disulfiram has decreased cocaine use in a number of studies. Amantadine, another medication with dopaminergic effects, may also be effective in cocaine users with high withdrawal severity. GABA is the main inhibitory neurotransmitter in the brain, and accumulating evidence suggests that the GABA system modulates the dopaminergic system and cocaine effects. Two anticonvulsant medications with GABAergic effects, tiagabine and topiramate, have yielded positive findings in clinical trials. Baclofen, a GABAb receptor agonist, is also promising, especially in those with more severe cocaine use. Some of the physiological and behavioural effects of cocaine are mediated by activation of the adrenergic system. In cocaine users, propranolol, a β-adrenoceptor antagonist, had promising effects in individuals with more severe cocaine withdrawal symptoms. Cerebral vasodilators are another potential target for cocaine pharmacotherapy. Cocaine users have reduced cerebral blood flow and cortical perfusion deficits. Treatment with the vasodilators amiloride or isradipine has reduced perfusion abnormalities found in cocaineusers. The functional significance of these improvements needs to be further investigated. All these proposed pharmacotherapies for cocaine addiction act on neural pathways. In contrast, immunotherapies for cocaine addiction are based on the blockade of cocaine effects peripherally, and as a result, prevent or at least slow the entry of cocaine into the brain. A cocaine vaccine is another promising treatment for cocaine addiction. The efficacy of this vaccine for relapse prevention is under investigation. Many initial promising findings need to be replicated in larger, controlled clinical trials.

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Acknowledgements

This research was supported by grants from National Institute on Drug Abuse (P-50 DA 12762 and K05-DA 0454). The authors declare no conflict of interest directly relevant to the contents of this review.

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Correspondence to Dr Mehmet Sofuoglu.

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Sofuoglu, M., Kosten, T.R. Novel Approaches to the Treatment of Cocaine Addiction. CNS Drugs 19, 13–25 (2005). https://doi.org/10.2165/00023210-200519010-00002

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Keywords

  • Cocaine
  • Gabapentin
  • Baclofen
  • Amantadine
  • Selegiline