JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Cost-effectiveness of several atypical antipsychotics in orally disintegrating tablets compared with standard oral tablets in the treatment of schizophrenia in the United States.

OBJECTIVE: Although the use of innovative drug delivery systems, like orally disintegrating antipsychotic tablets (ODT), may facilitate medication adherence and help reduce the risk of relapse and hospitalization, no information is available about the comparative cost-effectiveness of standard oral tablets (SOT) vs ODT formulations in the treatment of schizophrenia. This study compared the cost-effectiveness of olanzapine ODT and olanzapine SOT in the usual treatment of outpatients with schizophrenia from a US healthcare perspective. The study also compared olanzapine ODT with risperidone and aripiprazole, two other atypical antipsychotics available in both ODT and SOT formulations.

METHODS: Published medical literature and a clinical expert panel were used to populate a 1-year Monte Carlo Micro-simulation model. The model captures clinical and cost parameters including adherence levels, treatment discontinuation by reason, relapse with and without inpatient hospitalization, quality-adjusted life years (QALYs), treatment-emergent adverse events, healthcare resource utilization, and associated costs. Key outcomes were total annual direct cost per treatment, QALY, and incremental cost-effectiveness (ICER) per 1 QALY gained.

RESULTS: Based on model projections, olanzapine ODT therapy was more costly ($9808 vs $9533), but more effective in terms of a lower hospitalization rate (15% vs 16%) and better QALYs (0.747 vs 0.733) than olanzapine SOT therapy. Olanzapine ODT was more cost-effective than olanzapine SOT (ICER: $19,643), more cost-effective than risperidone SOT therapy (ICER: $39,966), and dominant (meaning less costly and more effective) than risperidone ODT and aripiprazole in ODT or SOT formulations.

LIMITATIONS: Lack of head-to-head randomized studies comparing the three studied atypical antipsychotics required making input assumptions that need further study.

CONCLUSIONS: This micro-simulation found that the utilization of olanzapine ODT for the treatment of schizophrenia is predicted to be more cost-effective than any other ODT or SOT formulations of the studied atypical antipsychotic medications.

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