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Naveglitazar, a non-thiazolidinediones (TZD), functions as a potent and efficacious insulin sensitizer in rodents, possessing a novel profile that may result in an improved therapeutic agent for the treatment of type 2 diabetes and associated dyslipidemia. The extent of in vitro binding of [ ³ H]Naveglitazar to plasma proteins is evaluated by ultracentrifugation in mouse, rat, and monkey plasma. The mean percentages±S.E.M. of protein binding of radioactivity in plasma over the concentration range of 0.1 to 1000 ng/ml after in vitro incubation at 37°C for 60 min are 99.5%±0.1% (mice), 99.6%±0.1% (rat), and 99.6%±0.3% (monkey). These results show that Naveglitazar is highly bound to plasma proteins among the species examined, and binding is independent of concentration.

[ ¹⁴ C]Naveglitazar is quickly absorbed and moderately metabolized before elimination. After oral administration, 47, 31, and 62% of the radioactivity, as assessed by AUC values, are circulating as metabolites in mice, rats, and monkeys, respectively. Half-lives for Naveglitazar and radioactivity are similar within each species; however, monkeys have substantially longer half-lives in comparison to mice and rats. Naveglitazar and radioactivity are slowly cleared from the system circulation in all species evaluated.