A Study of How Long it Takes a Patient to Relapse After Switching From an Oral Antipsychotic to One of Two Doses of Long-acting Risperidone Injections in Patients With Schizophrenia or Schizoaffective Disorder
The purpose of this study is to assess the time for patients to relapse when switched from an oral antipsychotic to one of two doses of long-acting risperidone injection (shots). Risperidone has been used successfully to treat schizophrenia and schizoaffective disorder.
Drug: Risperidone, long-acting injectable
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Primary Purpose: Treatment
|Official Title:||A 52-wk Prospective, Randomized, Double-blind, Multicenter Study of Relapse Following Transition From Oral Antipsychotic Medication to 2 Different Doses (25 or 50 mg Every 2 Wks) of Risperidone Long-acting Microspheres (Risperdal� CONSTA�) in Adults With Schizophrenia or Schizoaffective Disorder|
- Risperidone effectiveness is measured by time to relapse within the 52 week period.
- Effectiveness of the drug is assessed by the Clinical Global Impression Scale and Positive and Negative Syndrome Scale; safety as assessed by the Extrapyramidal Symptom Rating Scale and treatment-emergent adverse events during the 52 week period.
|Study Completion Date:||September 2004|
Results from studies of older long-acting injectable antipsychotics (not risperidone) show that patients tend to relapse (which means start having symptoms again) when they are given low doses. However, increasing the dose may cause more side effects. This study will measure the time to relapse during a 52-week period in patients with schizophrenia or schizoaffective disorder who are switched from an oral antipsychotic (one taken by mouth) to one of two doses of long-acting risperidone injections (shots). The patients will be assigned to a dose of either 25 or 50 milligrams per injection every 2 weeks. Patients continue to take their usual oral antipsychotic medications up to 3 weeks following the first injection. After this 3-week period, they will receive the injectable risperidone only. Patients will be asked questions at each visit to help determine the effectiveness of the drug as assessed by the Clinical Global Impression Scale and the Positive and Negative Syndrome Scale. The safety of the drug will be based on patient signs and symptoms assessed according to the Extrapyramidal Symptom Rating Scale and self-reported treatment-emergent adverse events. Long-acting risperidone injection, 25 or 50 milligrams per injection, every 2 weeks for 52 weeks. Patients will continue to take their current oral antipsychotics for up to 3 weeks following the first injection of risperidone.
|Study Director:||Johnson & Johnson Pharmaceutical Research & Development, L.L. C. Clinical Trial||Johnson & Johnson Pharmaceutical Research & Development, L.L.C.|