Vanda receive non approvable letter for Iloperidone

Vanda Pharmaceuticals have received a not approvable letter from the US FDA for iloperidone, an atypical antipsychotic under development for schizophrenia. The FDA expressed concern about the efficacy of iloperidone in patients with schizophrenia relative to the active comparator, risperidone (Risperdal(R), Johnson & Johnson), used in prior studies.