There is no clear evidence that treating schizophrenia with anti-psychotic drugs early is effective. The British NICE guidelines recommend cognitive behavioural talk therapy for all people at risk. In recent research, 76 patients at risk for schizophrenia were divided into two groups. One group got omega3 for 3 months and the other got a dummy pill (food oil). After 12 months only 4.9% of the omega 3 group had got schizophrenia compared to 27.5% in the other group. There is some evidence which shows that early treatment with drugs improves short term outcomes for people who have a serious episode of mental illness. These measures show little benefit five years later. Attempting to prevent schizophrenia in the pre-onset phase with anti-psychotic drugs is of uncertain benefit and so is not recommended (as of 2009). Prevention is difficult because there is no reliable way to find out in advance who will get schizophrenia.