Augmentation of clozapine with ziprasidone in refractory schizophrenia: a double-blind, placebo-controlled study.

AbstractThe present 16-week double-blind, randomized, placebo-controlled trial was aimed to explore the efficacy of ziprasidone add-on pharmacotherapy on clinical symptoms and cognitive functioning in 40 schizophrenic patients (active group, n = 20; placebo group, n = 20) with residual symptoms (Bri