Comparing the efficacy of long-acting pharmaceutical forms (depot) versus oral pharmaceutical forms of atypical and conventional antipsychotics used in Spain for treating patients with schizophrenia

Abstract

Introduction and objectives: Currently in Spain, 4 depot antipsychotics are available: flufenazine, pipotiazine, zuclopentixol and risperidone. The objectives of the present study are: a) to evaluate the efficacy of depot vs. oral forms of typical and atypical antipsychotics available in Spain for treating patients with schizophrenia; b) to compare the efficacy of different depot antipsychotics; c) to evaluate cost-effectiveness of typical and atypical depot and oral antipsychotics.

Methods: Systematic review of the literature between January 1980 and March 2007. Pharmaceutical companies of depot preparations were contacted aiming to include unpublished material.

Results: A total of 15 studies were included (13 journal manuscripts and 2 posters provided by the industry). Concordance between evaluators was moderate-high. The quality of selected studies was moderate-low. There were no differences in the efficacy between depot and oral risperidone. Efficacy of depot risperidone was higher than oral olanzapine (there were no differences regarding tolerability) and higher and better tolerated than oral zuclopentixol. The evidence was controversial when comparing the efficacy of depot and oral flufenazine. There were no differences when comparing the efficacy between depot flufenazine and oral pimozide. Depot zuclopentixol was more efficient than the oral preparation for treating patients with schizophrenia and violent behaviour. Finally, there were no differences regarding the efficacy and tolerability between depot pipotiazine and depot flufenazine and between depot clopentixol and depot flufenazine.

Conclusions: There is few high-quality scientific evidence comparing depot and oral antipsychotics or different depot antipsychotics available in Spain. Selected evidence does not allow to conclude that depot antipsychotics are more effective and better tolerated than oral ones.