The dually diagnosed patient with attention deficit disorder, residual type (ADDRT) may be especially prone to cocaine abuse, because ADD includes dopamine deficiencies and cocaine is a dopamine agonist. It is hypothesized that bromocriptine, a dopamine agonist, will reduce a patient's craving for cocaine and simultaneously address the patient's ADD-RT symptoms. A single-organism, double-blind research design is used to evaluate the efficacy of bromocriptine, as measured by scale 9 of the MMPI, the digit span and digit symbol tests of the Wechsler Intelligence Scale-Revised, and the signaling to numbers test. Statistical analysis of the results revealed an equivocal response to bromocriptine.