Medicine After a hypophysectomy, vasopressin is given IM for which of the following reasons? A To treat growth failure B To prevent syndrome of inappropriate antidiuretic hormone (SIADH) C To reduce cerebral edema and lower intracranial pressure D To replace antidiuretic hormone (ADH) normally secreted by the pituitary. 💡 Explanation After a hypophysectomy, vasopressin is given IM for which of the following reasons? ✓ Correct Answer: D. To replace antidiuretic hormone (ADH) normally secreted by the pituitary.