Does prolactin affect libido?
Yes. Elevated prolactin suppresses GnRH and lowers testosterone; in both sexes it contributes to low libido and sexual changes. Persistent elevation prompts a workup including pituitary review.
Full answer
Prolactin suppresses GnRH at the hypothalamus, lowering LH/FSH and downstream testosterone. Elevated prolactin in men contributes to low libido, erectile changes, and low testosterone; in women, it contributes to menstrual disruption and low libido. The workup repeats prolactin fasted and midmorning, screens medications (antipsychotics, metoclopramide, opiates, some antidepressants), checks TSH, and runs a macroprolactin assay to exclude artifact. Persistent unexplained elevation prompts pituitary MRI.
Educational. Not a substitute for individualized provider review.
- Methodology — Primary source · oMeds
- Reviewed by Dr. Laura Purdy, MD, MBA · Clinical Director, oMeds · Last reviewed 2026-06-03