This will be a 16-week, double blind, placebo controlled randomized trial of aripiprazole added to an existing stabilized regimen of antipsychotics (either risperidone or paliperidone oral or long acting injectable formulations) for treatment of elevated symptomatic prolactin levels. Aripiprazole dosing will begin at 5 mg/day once daily and increased to 10mg by mouth once daily at the end of week 2 and then increased to 15 mg/day once daily at the end of week 8 in women who have not yet regained their menstrual period. If a woman gets her menstrual period on the 5 or 10 mg dose she will remain on this dose for the study. Women will remain on their current stabilized medication regimen during the course of the adjunctive trial of aripiprazole or placebo. Subjects will be able to receive anticholinergic medications as needed (e.g., benztropine and diphenhydramine) for extrapyramidal side effects, propranolol for akathisia, and benzodiazepines (e.g.,lorazepam) for agitation or anxiety.