Dramatherapy is using drama as a tool for therapeutic aims. Dramatherapy has inspired my way of working as a drama coach. However, I don't work as a therapist, but use many of the exercises and tools from this area. Generally there has to be an agreement on both parties for therapy to be called therapy. Using drama in a coaching way instead opens up more frredom for the roles to be taken and can -and will certainly- still have therapeutic outcomes.
The Dramatherapy training that Petra did was situated in London at Central School of Speech and Drama. You find the link below.