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Prevalence and prediction of psychotropic drug use in California developmental centers.

The extent of psychotropic drug use was evaluated in California's institutionalized developmentally disabled population (N = 6,450). Mean psychotropic drug use was 35.4% for the entire population (range = 13.7% to 63.6% across institutions), with antipsychotic drug use at 26.8% (range = 11.0% to 59.6%). Psychotropic drug use was positively associated with aggression, IQ, depression, and self-injurious behavior, ps less than .0001; it was inversely associated with cerebral palsy and epilepsy. When the influence of demographic and behavioral factors was controlled, significant institutional differences in drug use remained.