The purpose is to describe the frequency of this dreaded, but probably relatively rare, side effect and find predictors for its emergence. The perspective is that we will be better to advise the individual patient about the advantages and disadvantages of the treatment. The project is mentioned in the Government's Psychiatry Plan and is likely to be financed in connection with this. The project will start in 2019 and it is financet by the Government's SATS-funds.