Objective: To compare the clinical efficacy of ezetimibe 5 mg (prescribed as a 10-mg tablet split in half) with a whole 10-mg tablet.
Study design: From January 2003 through July 2005, all Bronx Veterans Administration ezetimibe prescriptions were for 10 mg. In August 2005, it was mandated that all new ezetimibe prescriptions be 5 mg, prescribed as a 10-mg tablet split in half.
Methods: The impact of the 2 ezetimibe dosing strategies on percent lowering of low-density lipoprotein cholesterol (LDL-C) and achievement of National Cholesterol Education Program Adult Treatment Panel III (ATP III) goals was assessed in all patients prescribed ezetimibe 5 or 10 mg.
Results: A total of 272 patients were prescribed ezetimibe; 86 received 5 mg and 186 received 10 mg. Of those 272 patients, 197 had evaluable baseline and posttreatment LDL-C (55 taking the 5-mg dose and 142 taking the 10-mg dose). The effects of ezetimibe 5 and 10 mg on all lipid parameters were similar. Ezetimibe 10 mg reduced LDL-C by 26.1%, whereas 5 mg reduced LDL-C by 25.8%. The percentages of patients achieving goal LDL-C were similar: 61.8% (5 mg) and 60.5% (10 mg).
Conclusion: These data strongly suggest that ezetimibe 5 mg and ezetimibe 10 mg are clinically equivalent with respect to LDL-C reduction and achievement of ATP III LDL-C goals. Widespread adoption of this low-dose strategy could result in a potential cost savings of more than a billion dollars annually, with a potential reduction in hepatotoxicity.