As antipsychotic agents are increasingly used, many patients are at risk for antipsychotic-induced hyperprolactinemia.

Estimate the prevalence of hyperprolactinemia in patients treated by a single antipsychotic and identify the risk factors for its occurrence.

This is a prospective study carried out at the psychiatric department of psychiatry of university hospital of Mahdia during 24 months. We have included all patients with a follow up and treated by single antipsychotic for at least 12 weeks. A pituitary MRI has been requested for patients with a prolactin level higher than 100 ng/ml.

We have collected 92 patients. Hyperprolactinemia was found in 34.8% of patients among which 7.6% have had prolactin level greater than 150 ng/ml. Pituitary MRI have revealed 2 cases of macro-adenoma. The decrease of the antipsychotic doses has significantly improved prolactin levels. The switch of antipsychotic with another less inducing hyperprolactnimea has significantly decreased prolactin levels. 7 factors were correlated significantly to hyperprolactinemia: sex (female), substance use, presence of side effects, combination of psychotropic drugs, atypical antipsychotics, type of antipsychotic: Haloperidol and amisulpride, antipsychotic dose greater than 1000 mg Chlorpromazine equivalent.

Hyperprolactinemia must be carefully identified, through a pre-therapeutic assessment and monitoring of patients.

The authors have not supplied their declaration of competing interest.