Quetiapine extended release for the treatment of bipolar disorder.

Management of bipolar disorder (BD) requires a complex combination of pharmacological and psychosocial interventions. Over recent decades the therapeutic arsenal for BD has expanded to include lithium, anticonvulsants and second-generation antipsychotics (SGAs). Immediate release (IR) quetiapine fumarate is a SGA approved in several countries for the treatment of patients with schizophrenia and BD or as an add-on treatment for major depressive disorders. Extended release (XR) quetiapine fumarate was developed more recently. There is interest in a once-daily formulation which may improve patient compliance but there may be some differences between quetiapine IR and XR in terms of safety and efficacy. This article provides an update of recent data on the efficacy and safety of quetiapine XR for the treatment of BD.