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Normal prolactin levels for men range from 3 to15 nanograms per milliliter or 3 to15 micrograms per liter. For nonpregnant women, the range is 4 to 23 nanograms per milliliter or 4 to 23 micrograms per liter, according to WebMD.
Hyperprolactinemia, where prolactin levels are higher than normal, leads to suppression of libido and to sexual dysfunction in both men and women. We interpret this effect of high prolactin levels as similar to the refractory period following sex.