ABSTRACT
As more effective treatments for schizophrenia have evolved, emphasis
has started to be placed on defining interventions for the individual
symptoms rather than on the whole schizophrenia syndrome. The hall-
mark positive symptoms, i.e. hallucinations and delusions, are a case in
point. Although the severity of these symptoms may be controlled by
medication, it is not uncommon for them to persist, or at least to
reappear in subsequent relapses, despite adequate doses of medication.
For some patients the effects of medication on positive symptoms
