Introduction: In 2012, the Veterans Affairs (VA) Pharmacy Benefits Management Services created recommendations for antipsychotic selection in schizophrenia and schizoaffective disorders. The recommendations stated that patients must fail two first line agents (haloperidol, loxapine, quetiapine, risperidone or perphenazine) and clozapine (if appropriate) before being allowed to trial second line agents olanzapine, ziprasidone or aripiprazole. The aim of this project was to determine the amount of cost savings that could have been provided had the above recommendations been implemented last year.
Use of second generation antipsychotics has been associated with weight gain, diabetes, and worsening lipid profiles. The American Diabetes Association (ADA) has created guidelines regarding cardiometabolic monitoring of second generation antipsychotic agents. A secondary aim of this project was to determine the rate of provider adherence to the ADA recommendations.
Methods: A retrospective chart review was performed for patients >18 years of age who were initiated on aripiprazole, ziprasidone, or olanzapine for all indications between July 1, 2011 and July 1, 2012. The costs of the mean doses of these agents were compared to an equivalent mean dose of the first line agent risperidone (4mg) using VA drug acquisition costs.
Cardiometabolic monitoring data were collected to include weight, blood pressure, fasting glucose and fasting lipid profiles at baseline and at 12 weeks.
Results: Of the 542 patients started on second line agents, only 68 met criteria for their use. A potential cost savings of over $850,000 may have been realized had these criteria been enacted within the one year time period studied.
None of the 542 patients had both baseline and follow-up values for weight, blood pressure, fasting glucose and fasting lipid profiles. While roughly 60% of patients had blood pressure and weight values at baseline and 27% had glucose and cholesterol values, less than 14% received follow-up testing with approximately 2% receiving neither baseline nor follow-up testing.
Discussion: Significant cost savings can be realized via the use of selection criteria without sacrificing efficacy as most studies do not demonstrate the superiority of one agent and the rates of adverse events between first and second generation agents are more similar than previously thought. This study also highlighted the lack of adequate cardiometabolic monitoring which could lead to cardiovascular disease.
