600 stroke patients will be randomised to either escitalopram or placebo treatment in a 1:1 ratio and genotyped according to SERT polymorphisms. The treatment and follow up period is 6 months. During these 6 months there will be 2 clinical follow up visits, one telephone control and one visit to evaluate compliance regarding medication. Patients who had an MRI as a part of the routine investigations done upon admission (approximately 300 patients) will have a control MRI after 6 months.