However, there was no correlation between the number or dose of antipsychotics, duration of illness, or prolactin level, suggesting that follow-up of hyperprolactinemia or sexual dysfunction is necessary in both patients with long-term schizophrenia who receive massive doses of therapy with several antipsychotics and in patients with short-term schizophrenia who are receiving low-dose monotherapy. Here, PRL is linked to hyperprolactinemia.