Hyperprolactinaemia is often found in patients with schizophrenia and usually considered a consequence of antipsychotics. Prolactin levels were measured in 43 At-Risk Mental State individuals (ARMS) and 26 patients with First Episode Psychosis (FEP). Hyperprolactinaemia was found in 25.6% of ARMS and 46.2% of FEP. Within 60 antipsychotic-naïve ARMS and FEP, hyperprolactinaemia was found in 26.7%. Hyperprolactinaemia may be pre-existing in a subgroup of patients with schizophrenia.
