The purpose of this 6-week study is to determine whether treatment with Seroquel® Sustained Release (SR) is more effective than placebo in the treatment of acute schizophrenia.

PLEASE NOTE: Seroquel SR and Seroquel XR refer to the same formulation. The SR designation was changed to XR after consultation with FDA.

Inclusion Criteria:

• To be considered for this study the patients should be aged between 18 to 65 years, need to suffer from schizophrenia and must be willing to participate.

Exclusion Criteria:

• Patients that suffer from psychiatric disorders other than schizophrenia including drug abuse and dependence, or medical conditions such as specific kidney, heart or thyroid problems, and patients with a known lack of response to drugs for schizophrenia will not be considered for this study.