Hyperprolactinemia is a side effect of anti-psychotic medications, less so with the atypical antipsychotics (like Risperdal) than with the traditional antipsychotics. Risperdal is more prone to a side effect of elevated prolactin levels than are other atypical antipsychotics (like olanzipine or clozapine). Sometimes the elevation is only transitory in nature.
Elevated prolactin levels are determined by several prolactin levels taken on different mornings. The several levels are normally required because prolactin secretion occurs in an episodic, not continuous, fashion. There are approximately 14 pulses over a 24-hour period. Peak levels occur at night and low levels around noon. Prolactin levels greater than 20ug/L, observed on multiple occasions, are indicative of hyperprolactinemia. Women with elevated prolactin levels typically experience menstrual irregularities and infertility. With men, common symptoms are diminished libido, erectile dysfunctions, infertility, galactorrhea and gynecomastia (breast enlargement). Relative to alternative treatments, another antipsychotic (like olanzipine) could be tried. Or, a different approach would involve, as your psychiatrist suggested, treatment with one of the serotoninergic drugs (Prozac, Celexa, Lexipro, Zoloft, Paxil). Non-stimulant treatments for ADHD include Tenex or Clonidine, Wellbutrin, or Strattera. So, there are alternatives.