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Great interest has been shown by the medical community and the public in the cannabinoid CB₁ receptor antagonists, such as rimonabant, for treatment of obesity, metabolic syndrome, and possibly drug addiction.

This novel class of drug has therapeutic potential for other disorders, as the endocannabinoid system is involved in various health conditions. However, rimonabant, the first clinically available member of this class of drugs, has been linked to increased risk of anxiety, depression, and suicidality. Due to those risks, the European Medicines Agency called for its withdrawal from the market in October, 2008. Shortly after this decision, several pharmaceutical companies (Sanofi-aventis, Merck, Pfizer, Solvay) announced that they would stop further clinical research on this class of drug. Here, we provide an overview of those …