What condition is characterized by galactorrhea, impotence, menstrual dysfunction, and decreased libido?

The condition characterized by galactorrhea, impotence, menstrual dysfunction, and decreased libido is hyperprolactinemia. This hormonal disorder involves the excessive production of prolactin, which can disrupt normal hormonal balances in both men and women.

Elevated prolactin levels can lead to symptoms such as galactorrhea, which is the inappropriate secretion of milk from the breasts, and menstrual dysfunction in women, such as irregular menstrual cycles or amenorrhea. In men, high prolactin levels can result in impotence and decreased libido due to the suppression of gonadotropin-releasing hormone, which in turn affects testosterone production.

While dopamine antagonists can lead to hyperprolactinemia by blocking dopamine receptors and reducing prolactin inhibition, this option specifically pertains to the underlying condition rather than the effects of drug treatment. Conditions like depression and bipolar disorder can also present with some overlapping symptoms, but they do not specifically focus on the endocrine abnormalities associated with elevated prolactin levels. Thus, the presence of the specific combination of symptoms points directly to hyperprolactinemia as the most accurate answer.