Purpose:To compare the therapeutic effect of rimonabant, a new drug which is a selective antagonist of CB1 receptors, with the sibutramine. Methods: It is an experimental clinical trial, prospective, placebo controlled. Our test was performed in 38 rats, adults females with a hyper caloric diet. We collected their blood 3 times and weighted them once a week. We divided the rats in 3 groups: Rimonabant, Sibutramine and Control. Statistic analysis has been made through ANOVA test, Tukey test and t Student test. Results:The Rimonabant group demonstrated a significant reduction of the weight increase in rats. The Sibutramine group showed a significant reduction on blood glycemia compared to Rimonabant group and Control group. Conclusions: Rimonabant showed to be more effective than Sibutramine by decreasing weight gain. Sibutramine has been more effective than Rimonabant and Control groups by decreasing the blood glycemia. Key words: Obesity. Drug Effects. Animal Experimentation. Rats. RESUMO Objetivo:Comparar o efeito do rimonabanto, nova droga seletivamente antagonista dos receptores CB1, com a sibutramina. Métodos: Ensaio clínico experimental, prospectivo, placebo controlado. Realizado com 38 ratas, adultas, submetidas a dieta hipercalórica. Foram coletadas 3 amostras de sangue e o peso controlado semanalmente. Foram divididas em 3 grupos: Rimonabanto, Sibutramina e Controle. Analise estatística realizada com ANOVA, teste t de Student e teste de Tukey. Resultados: O grupo Rimonabanto obteve redução significante do ganho de peso. O grupo Sibutramina teve redução significativa da glicemia quando comparado aos demais grupos. Conclusões: Rimonabanto foi mais efetivo que a Sibutramina na redução do ganho de peso. A Sibutramina foi mais efetiva na redução da glicemia do que os grupos controle e Rimonabanto. Descritores: Obesidade. Efeitos de Drogas. Experimentação Animal. Ratos.
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