Antipsychotic drugs are characterized by blocking dopaminergic D2 receptors. They have been found to be effective and safe for the treatment of schizophrenia, bipolar disorders, depressive episodes associated with bipolar disorder, or psychotic symptoms in the context of Parkinson's disease. Atypical antipsychotics have lower blocking potency on D2 receptors, at the time that interact with serotoninergic, adrenergic and histaminergic receptors, among others. Quetiapine extended-release has the same clinical efficacy as the immediate-release formulation, but reduces the amount of daily doses, possibly contributing to increased treatment adherence.