Antipsychotic-induced hyperprolactinemia results from blockade of which pathway?

Prepare for the Dr. High Yield Psychiatry Test. Study with flashcards and multiple choice questions, each with hints and explanations. Ensure success in your exam!

Multiple Choice

Antipsychotic-induced hyperprolactinemia results from blockade of which pathway?

Explanation:
Dopamine normally keeps prolactin release in check by acting on D2 receptors in the tuberoinfundibular pathway, which carries signals from the hypothalamus to the anterior pituitary. When antipsychotics block these D2 receptors in this pathway, the inhibitory brake on prolactin is removed, leading to increased prolactin release and hyperprolactinemia. This explains the common side effects like galactorrhea, amenorrhea, and sexual dysfunction. The other pathways have different roles: the mesolimbic pathway is tied to positive psychotic symptoms, the nigrostriatal pathway to motor control and extrapyramidal symptoms, and the corticospinal tract is a major motor pathway not involved in prolactin regulation.

Dopamine normally keeps prolactin release in check by acting on D2 receptors in the tuberoinfundibular pathway, which carries signals from the hypothalamus to the anterior pituitary. When antipsychotics block these D2 receptors in this pathway, the inhibitory brake on prolactin is removed, leading to increased prolactin release and hyperprolactinemia. This explains the common side effects like galactorrhea, amenorrhea, and sexual dysfunction. The other pathways have different roles: the mesolimbic pathway is tied to positive psychotic symptoms, the nigrostriatal pathway to motor control and extrapyramidal symptoms, and the corticospinal tract is a major motor pathway not involved in prolactin regulation.

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy