Clozapine and risperidone have been implicated in the development of obsess
ive-compulsive symptoms. We present three cases in which olanzapine caused
a significant exacerbation of obsessive-compulsive symptoms in schizophreni
a (two cases) and obsessive-compulsive disorder (one case). (C) 2000 Elsevi
er Science B.V. All rights reserved.