Classification and treatment of obsessional slowness.

Obsessional slowness is regarded as an uncommon but severely disabling variant of obsessive-compulsive disorder. This paper examines the psychopathology, classification, pathophysiology and treatment of obsessional slowness. It argues that primary obsessional slowness does not require classification as a separate syndrome because it can be found to be secondary to recognised phenomena of obsessive-compulsive disorder or anankastic personality disorder. The treatment described in the literature is not thought to be successful in the long term, and controlled trials are required to evaluate new strategies and antidepressant medication.