Long-acting injectable risperidone v. olanzapine tablets for schizophrenia or schizoaffective disorder. Randomised,...

The efficacy and safety of long-acting injectable risperidone have not been compared with those of an oral atypical antipsychotic.

To compare long-acting risperidone and oral olanzapine in 377 patients with DSM-IV schizophrenia or schizoaffective disorder.

Patients were randomised to receive long-acting risperidone (25 mg or 50 mg every 14 days) or olanzapine (5-20 mg/day).

In the 13-week phase, long-acting risperidone was at least as effective as (not inferior to) oral olanzapine. In the 12-month phase, significant improvements in the Positive and Negative Syndrome Scale (PANSS) total and factor scores from baseline to month 12 and end-point were seen in both groups of patients. Few patients discontinued treatment because of an adverse event.

Both treatments were efficacious and well tolerated.