Objective: Few studies have prospectively compared the change of prolactin levels in children and adolescents associated with the use of atypical antipsychotic agents. In our study, we present preliminary data of an ongoing study, which compares changes in prolactin levels in children and adolescents after treatment to risperidone versus olanzapine versus quetiapine. We hypothesized: (1) risperidone would be associated with hyperprolactinemia most frequently, and (2) postpubertal females may be at higher risk of prolactin elevation and associated adverse effects.
Methods: Prolactin levels were obtained at baseline and after a mean of 11.2 weeks (SD = 2.2; range, 4-15 weeks) from 40 subjects (mean age, 13.4 years; SD = 3.4; range, 5-18 years) who were started on risperidone (n = 21), olanzapine (n = 13), or quetiapine (n = 6). End-point prolactin levels were compared using a Kruskal-Wallis test.
Results: End-point prolactin levels were significantly higher with risperidone, compared to olanzapine (p = 0.027) or quetiapine (p = 0.008). With the Bonferroni correction, the latter remains significant. Twenty-five percent of our subjects experienced sexual side effects at end point, independent of prolactin levels and antipsychotic agents.
Conclusion: Risperidone significantly increased prolactin levels in children and adolescents. The duration of this prolactin elevation, and its long-term effects in children and adolescents, are unknown.