Chapter 31: Pituitary Drugs – Hormones & Regulation

The text first outlines the normal physiology of the anterior (adenohypophysis) and posterior (neurohypophysis) pituitary lobes, explaining their distinct hormone secretions and the critical role of the negative feedback loop in maintaining physiological stability. Pituitary drugs are primarily used either as hormone replacement therapy for deficiencies or as diagnostic aids, working generally by either augmenting or antagonizing the effects of endogenous hormones. Specific anterior pituitary drugs discussed include somatropin, a recombinant growth hormone mimic used to stimulate skeletal growth in patients with inadequate endogenous hormone secretion; cosyntropin, which is utilized primarily for diagnosing adrenocortical insufficiency; and octreotide acetate, a synthetic polypeptide that antagonizes natural growth hormone and is vital for managing symptoms associated with carcinoid tumors, such as severe diarrhea, and bleeding esophageal varices. Posterior pituitary agents, vasopressin and desmopressin, mimic antidiuretic hormone (ADH) to increase water resorption in the kidneys, making them crucial for managing diabetes insipidus. Vasopressin is also highlighted as a potent vasoconstrictor used in hypotensive crises like septic shock and cardiac arrest, while desmopressin is also used in the treatment of hemophilia A and von Willebrand’s disease. The chapter emphasizes the comprehensive nursing process, including rigorous patient assessment for contraindications, monitoring for significant adverse effects like altered blood glucose levels and conduction abnormalities, recognizing key drug interactions, and providing detailed patient education on the safe administration of various routes, including subcutaneous and intranasal forms.