Reversal of Symptomatic Hyperprolactinemia by Aripiprazole
Anne was a 17-year-old adolescent diagnosed with schizophrenia complicated by medication noncompliance. She was admitted to the inpatient service while acutely psychotic. She had mild asthma but no other medical problems. Her periods had been normal since menarche. Her maternal grandfather also has schizophrenia but had been asymptomatic for many years while taking haloperidol.Risperidone was started because of the option for a long-acting formulation. Anne accepted the idea of an intramuscular injection because of her grandfather’s history. Her oral dose was titrated up to 4 mg/day over 2 weeks, after which she received her first injection of 25 mg. She reported a decrease in psychotic symptoms but began to complain of bilateral breast pain, swelling, and galactorrhea. Serum prolactin was drawn and found to be elevated, at 119 μg/ml (normal range 0–25 μg/ml). Aripiprazole (15 mg/day) was added to her drug regimen because of its partial agonism at the dopamine receptor (2), making it a theoretically useful tool in lowering prolactin. Anne remained taking oral risperidone, 4 mg/day, and had a gradual resolution of her breast pain and galactorrhea. Another prolactin level taken 12 days later was 18 μg/ml. Anne was discharged from the hospital much improved while taking a combination of a long-acting intramuscular injection of risperidone, 25 mg every 2 weeks, and aripiprazole, 15 mg/day.
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