Study Suggests Risperidone Long-Acting Injection Combined with Standard Treatment Helped Delay Time to Relapse in Patients with Bipola...(inistered once every two weeks bya healt...)

In the study, 139 patients were randomized to receive either RLAI 25-50mg intramuscular injection (n=72), or placebo injections (n=67) adjunctive to standard treatment. Patients receiving RLAI plus standard treatment were eligible to enter the double blind phase of the trial if they met predefined criteria(a) for being stable the last four weeks of the 16-week open-label stabilization phase.

In the study, Frequently Relapsing Bipolar Disorder: Evidence for an Effective Treatment Using Adjunctive Risperidone Long-Acting Injectable, 67% of patients randomized received a 25 mg dose of RLAI, 29% received a 37.5 mg dose and 4% received a 50 mg dose, administered once every two weeks.

The primary efficacy endpoint in the double-blind phase of the trial was the time from randomization to relapse, where relapse was defined as the first occurrence of a mood episode as determined by an independent Relapse Monitoring Board (RMB).(b)

The results showed a significant difference in time to relapse (p=0.004), with a more than two-fold higher risk of relapse in the placebo group (47.8%) than the RLAI group (22.2%). In addition, scores on the Clinical Global Impression-Bipolar-Severity (CGI-BP-S) scale for overall bipolar disorder and the Clinical Global Impression-Bipolar-Change (CGI-BP-C) scale worsened significantly (p<0.05) in the placebo group compared with the RLAI group.

Treatment-emergent adverse effects (TEAEs) occurred more frequently in the group that received placebo and standard treatment (76.1%) than in the group that received RLAI and standard treatment (70.8%), as did serious adverse effects (placebo=19.4%; RLAI = 13.9%). The most common TEAEs (greater than 5%) in the double-blind phase were tremor (RLAI = 23.6%; placebo = 16.4%), insomnia (RLAI = 19.4%; placebo = 23.9%), muscle rigidity
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