A nurse is caring for a client who has a new diagnosis of adrenal insufficiency. Which of the following prescriptions should the nurse anticipate from the provider?

A. "Phenytoin": Phenytoin is an anticonvulsant used to prevent seizures, not for adrenal insufficiency. It does not treat the underlying hormonal imbalances or symptoms associated with adrenal insufficiency. B. "Calcitonin": Calcitonin is a medication used to treat conditions like osteoporosis or hypercalcemia, not adrenal insufficiency. It does not address the deficiency of adrenal hormones. C. "Buspirone": Buspirone is an anxiolytic medication used to treat anxiety. It has no role in the management of adrenal insufficiency, which requires hormonal replacement therapy. D. "Fludrocortisone": Fludrocortisone is a synthetic corticosteroid used to treat adrenal insufficiency. It helps to replace aldosterone, which is often deficient in clients with adrenal insufficiency, supporting fluid and electrolyte balance.