Researchers will use the Richmond Agitation Scale to measure your agitation or sedation before each injection of olanzapine through the catheter. It should take 5 to 10 minutes to answer the questions. You will be evaluated for catheter site reaction at the time of injection, at 30 minutes and 1 hour after the injection, and before all further injections of study drug. Your blood pressure will be evaluated before and 1 hour after the first two injections and then once a day while on study.