5 Other Endocrine Medications

How endocrine medications act

Endocrine medications may replace missing hormones, reduce excess hormone production or action, or alter pituitary signaling. Their effects and precautions depend on the hormone involved and the condition being treated.

Adrenal hormone replacement

In primary adrenal insufficiency, the adrenal glands do not provide enough cortisol and may also lack aldosterone activity. Hydrocortisone replaces cortisol, while fludrocortisone helps maintain sodium and fluid balance by replacing mineralocorticoid activity, including aldosterone effects.

People with secondary adrenal insufficiency usually retain aldosterone production and generally do not need fludrocortisone. The two medications therefore have distinct replacement roles; they do not both lower cortisol or both suppress ACTH.

Adrenal insufficiency during illness

Repeated vomiting that prevents a person with adrenal insufficiency from keeping oral hydrocortisone down can lead to adrenal crisis. The appropriate response is urgent medical care and following the clinician-provided emergency plan, including prescribed injectable corticosteroid if instructed—not skipping the dose, substituting fludrocortisone, or relying on home monitoring alone.

Cortisol after pituitary surgery

After surgery for a pituitary tumor causing Cushing disease, ACTH may be low temporarily. Because pituitary ACTH signals the adrenal glands to produce cortisol, the adrenal glands may not make enough cortisol during this period. Cortisol replacement may therefore be prescribed and later reassessed; it replaces cortisol, not ACTH.

Desmopressin and water balance

For central diabetes insipidus, desmopressin replaces vasopressin activity and reduces urine output. Follow the clinician’s fluid instructions rather than drinking as much as possible after a dose, taking extra doses when thirsty, or stopping the medication whenever urination decreases.

Excess fluid while taking desmopressin can be dangerous. Headache, confusion, or sudden weight gain may signal a serious fluid or sodium problem and should be reported.

Reducing growth hormone

Acromegaly may be treated with octreotide, a somatostatin analogue that can reduce growth hormone and IGF-1 in some patients. Monitoring may include hormone levels, glucose, thyroid function, and gallbladder complications.

Lowering prolactin

A prolactin-secreting pituitary adenoma can cause elevated prolactin, or hyperprolactinemia. Cabergoline is a dopamine agonist used to treat hyperprolactinemia by reducing prolactin secretion.

Leuprolide and changing hormone levels

Leuprolide is a GnRH agonist. During the first weeks of treatment, hormone levels may rise, so new or worsening symptoms should be monitored. With continued treatment, certain hormone levels decrease; an early rise does not by itself show that the medication is ineffective.