Efficacy and safety of atypical antipsychotic drugs (quetiapine, risperidone, aripiprazole and paliperidone) compared with placebo or typical antipsychotic drugs for treating refractory schizophrenia: overview of systematic reviews.
OBJECTIVE
According to some cohort studies, the prevalence of refractory schizophrenia (RS) is 20-40%. Our aim was to evaluate the effectiveness and safety of aripiprazole, paliperidone, quetiapine and risperidone for treating RS.


METHODS
This was a critical appraisal of Cochrane reviews published in the Cochrane Library, supplemented with reference to more recent randomized controlled trials (RCTs) on RS. The following databases were searched: Medical Literature Analysis and Retrieval System Online (Medline) (1966-2009), Controlled Trials of the Cochrane Collaboration (2009, Issue 2), Embase (Excerpta Medica) (1980-2009), Literatura Latino-Americana e do Caribe em Ciências da Saúde (Lilacs) (1982-2009). There was no language restriction. Randomized controlled trials, systematic reviews and meta-analyses evaluating atypical antipsychotics for treating RS were included.


RESULTS
Seven Cochrane systematic reviews and 10 additional RCTs were included in this review. The data generally showed minor differences between the atypical antipsychotics evaluated and typical antipsychotics, regarding improvement in disease symptoms, despite better adherence to treatment with atypical antipsychotics. Risperidone was specifically evaluated in patients with RS in one of the systematic reviews included, with favorable outcomes, but without definitive superiority compared with other drugs of proven efficacy, like amisulpride, clozapine and olanzapine.


CONCLUSIONS
The findings underscore the difficulty in treating these patients, with high dropout rates and treatment patterns of modest improvement in assessments of effectiveness. Atypical antipsychotics have advantages over typical antipsychotics mainly through their better safety profile, which leads to better adherence to treatment. A combination of antipsychotics may also be an option for some refractory patients.
Brazilian Cochrane Center, Universidade Federal de São Paulo, São Paulo, Brazil. tameln@terra.com.br
Tamara
T
Melnik
Bernardo Garcia
BG
Soares
Maria Eduarda Dos Santos
ME
Puga
Alvaro Nagib
AN
Atallah
D014150:Antipsychotic Agents / Q000009:adverse effects / Q000627:therapeutic use*; D000068180:Aripiprazole; D003987:Dibenzothiazepines / Q000009:adverse effects / Q000627:therapeutic use; D006801:Humans; D007555:Isoxazoles / Q000009:adverse effects / Q000627:therapeutic use; D015201:Meta-Analysis as Topic; D000068882:Paliperidone Palmitate; D010879:Piperazines / Q000009:adverse effects / Q000627:therapeutic use; D010919:Placebos / Q000009:adverse effects / Q000627:therapeutic use; D011743:Pyrimidines / Q000009:adverse effects / Q000627:therapeutic use; D000069348:Quetiapine Fumarate; D015363:Quinolones / Q000009:adverse effects / Q000627:therapeutic use; D016032:Randomized Controlled Trials as Topic; D012196:Review Literature as Topic; D018967:Risperidone / Q000009:adverse effects / Q000627:therapeutic use; D012559:Schizophrenia / Q000188:drug therapy*; D016896:Treatment Outcome
D014150:Antipsychotic Agents; D003987:Dibenzothiazepines; D007555:Isoxazoles; D010879:Piperazines; D010919:Placebos; D011743:Pyrimidines; D015363:Quinolones; D000069348:Quetiapine Fumarate; D000068180:Aripiprazole; D018967:Risperidone; D000068882:Paliperidone Palmitate