The effect of metformin on prolactin levels in patients with drug-induced hyperprolactinemia.

Abstract

BACKGROUND:

In bromocriptine-treated hyperprolactinemic patients with impaired glucose tolerance, metformin was found to reduce plasma levels of prolactin. No previous study has investigated its impact on plasma prolactin in patients with drug-induced hyperprolactinemia.

METHODS:

The study included 20 women with antipsychotic-induced hyperprolactinemia and 12 normoprolactinemic women, who, because of coexisting glucose metabolism abnormalities, were treated for 6months with metformin. Hyperprolactinemic patients with prediabetes received moderate doses of metformin (1.7g daily), while hyperprolactinemic and normoprolactinemic patients with type 2 diabetes were treated with high-dose metformin (2.55-3g daily). Fasting plasma glucose levels, the homeostatic model assessment 1 of insulin resistance ratio (HOMA1-IR), glycated hemoglobin, as well as plasma levels of prolactin, thyrotropin, adrenocorticotropic hormone and insulin-like growth factor-1 were assessed at baseline and after 6months of treatment.

RESULTS:

Despite reducing plasma glucose, HOMA1-IR, and glycated hemoglobin in all treatment groups, metformin decreased prolactin levels only if given at high doses to patients with elevated prolactin levels. No changes in thyrotropin, adrenocorticotropic hormone, and insulin-like growth factor-1 were observed in any treatment groups.

CONCLUSIONS:

The obtained results suggest that the effect of metformin on plasma prolactin depends on its dose and is observed only in patients with elevated levels of this hormone.

• Authors: Robert Krysiak, Karolina Kowalcze, Witold Szkrobka, Boguslaw Okopien
• Journal: European journal of internal medicine (Eur J Intern Med) Vol. 30 Pg. 94-98 (May 2016) ISSN: 1879-0828 [Electronic] Netherlands
• PMID: 26858210 (Publication Type: Journal Article)
• Copyright: Copyright © 2016 European Federation of Internal Medicine. Published by Elsevier B.V. All rights reserved.

Chemical References

• Antipsychotic Agents
• Blood Glucose
• Hypoglycemic Agents
• Prolactin
• Thyrotropin
• Metformin

Topics

• Adult
• Antipsychotic Agents (adverse effects)
• Blood Glucose (drug effects)
• Diabetes Mellitus, Type 2 (drug therapy)
• Female
• Humans
• Hyperprolactinemia (chemically induced, drug therapy)
• Hypoglycemic Agents (administration & dosage)
• Metformin (administration & dosage)
• Middle Aged
• Poland
• Prolactin (blood)
• Thyrotropin (blood)