FAST-A Study to Evaluate the Efficacy and Safety of Quetiapin IR in Patients With Acute Psychosis

Inclusion Criteria: * provision of written informed consent * male or female, aged 18-65 years * requirement of hospitalization and in need for antipsychotic treatment for an acute psychotic episode * able to swallow tablets from Day 1 Exclusion Criteria: * In-patients who are anticipated to be discharged before evaluation of the primary outcome variable at Day 5 * patients with known relevant clinical disease * history of syncope, or orthostatic hypotension * patients with known neutropenia