The post-traumatic stress disorder (PTSD) diagnosis has undergone large developments. With the changes in DSM-5 and the proposed changes in ICD-11, the two systems move in different directions. Treatment for PTSD is developing, but the evidence for the effect is lacking behind. Trauma-focused cognitive behavioural therapy and eye movement desensitization and reprocessing remain first choice. Pharmacotherapy is secondary. There is evidence for the effect of paroxetine, venlafaxine and fluoxetine and less so for sertraline.