The dangerous part is withdrawal. Prolonged use of exogenous corticosteroids is the most common cause of adrenal insufficiency, because the drug suppresses the patient's own hypothalamic-pituitary-adrenal axis and the glands atrophy (StatPearls). Pulling a patient off suddenly can drop them into adrenal crisis. Taper, every time (Cleveland Clinic Journal of Medicine).
Glucocorticoids and Mineralocorticoids: Generic and Brand Names
- Glucocorticoids
- beclomethasone (Beclovent)
- betamethasone (Celestone)
- budesonide (Rhinocort, Entocort EC)
- dexamethasone (Decadron)
- hydrocortisone (Cortef)
- methylprednisolone (Medrol)
- prednisolone (Delta-cortef)
- Mineralocorticoids
- fludrocortisone (Florinef)
- hydrocortisone (Cortef)
Disease Spotlight: Adrenal Insufficiency and Crisis
Adrenal insufficiency is a shortage of adrenocortical hormones. The patient shows confusion, hyperpigmentation, hypoglycemia, and a poor response to stress. It happens when the patient does not produce enough ACTH, when the glands cannot respond to ACTH, when an adrenal gland is damaged and cannot produce enough hormones (Addison's disease), or after surgical removal of the glands. Prolonged corticosteroid use is the more common cause.
Adrenal crisis is what happens when a patient who already has adrenal insufficiency hits extreme stress, a car accident, massive infection, or surgery. The body cannot supply the energy the sympathetic reaction demands. You see physiological exhaustion, hypotension, fluid shift, shock, and potentially death. Treat with massive infusion of replacement steroids, constant monitoring, and life support.
Glucocorticoids
Definition
Glucocorticoids drive glucose up for energy. They speed protein breakdown and slow protein formation from amino acids to preserve energy, and they support lipogenesis, the formation and storage of fat as an energy source.
Therapeutic Action
Glucocorticoids bind cytoplasmic receptors of target cells to reduce inflammation and suppress the immune system. Some, including hydrocortisone, cortisone, and prednisone, also carry mineralocorticoid activity, so they affect potassium, sodium, and water levels. They limit lymphocyte activity within the immune system and block the spread of phagocytes into the bloodstream and injured tissue.
Indications
Short-term treatment of inflammatory disorders, by blocking arachidonic acid and cutting prostaglandin and leukotriene formation. Local agents treat local inflammation. Systemic use covers some cancers, cancer-associated hypercalcemia, hematological disorders, and some neurological infections. Combined with mineralocorticoids, some of these drugs serve as replacement therapy for adrenal insufficiency.
Pharmacokinetics
Here are the characteristic interactions of glucocorticoids and the body in terms of absorption, distribution, metabolism, and excretion:
| Route | Onset | Peak | Duration |
|---|---|---|---|
| PO | Varies | 1-2 h | 1-1.5 d |
| Half-life (T1/2) | Metabolism | Excretion |
|---|---|---|
| 3.5 h | liver | urine |
Contraindications and Cautions
Allergy to any component, to prevent hypersensitivity reactions. Acute infection, which the drug's blocking effect on inflammation and immunity can worsen. Diabetes, because the glucose-elevating effect disrupts control. Other endocrine disorders, for risk of imbalance. Pregnancy, for potential fetal effects.
Adverse Effects
Increased methylprednisolone toxicity in African Americans, growth retardation, local inflammation and infection, and burning or stinging at the injection site.
Interactions
Erythromycin, ketoconazole, and troleandomycin increase toxic effects. Salicylates, barbiturates, phenytoin, and rifampin lower serum level and effectiveness.
Nursing Considerations
Nursing Assessment
Check for contraindications and cautions (allergy, pregnancy, acute infection) to avoid adverse effects. Get a baseline: weight, temperature, orientation and affect, grip strength, eye exam, blood pressure, pulse, peripheral perfusion and vessel status, respiration and adventitious breath sounds, glucose tolerance, renal function, and serum electrolytes.
Nursing Diagnoses
- Altered cardiac output related to fluid retention
- Excess fluid volume related to water retention
- Risk for infection related to immunosuppression
Implementation with Rationale
Give the drug daily at 8 to 9 AM to mimic the normal peak diurnal concentration and minimize suppression of the hypothalamic-pituitary axis (HPA). Space multiple doses evenly through the day toward homeostasis. Taper when discontinuing so the adrenal glands can recover and resume producing adrenocorticoids. Protect the patient from unnecessary exposure to infection and invasive procedures, because steroids suppress immunity and raise infection risk. Provide comfort measures, and teach drug effects and the warning signs to report.
Evaluation
Monitor response (relief of inflammation, adrenal function returning to normal limits), watch for adverse effects (infection, skin changes, fatigue), confirm the patient can name the drug, its indication, and adverse effects to watch for, and track compliance.
Mineralocorticoids
Description
Mineralocorticoids act directly on electrolyte levels to maintain homeostasis. The classic one is aldosterone.
Therapeutic Action
Aldosterone increases sodium reabsorption in the renal tubules and increases potassium and hydrogen excretion, producing water and sodium retention.
Indications
Partial replacement therapy in cortical insufficiency, treatment of salt-losing adrenogenital syndrome, and off-label treatment of hypotension.
Pharmacokinetics
Here are the characteristic interactions of mineralocorticoids and the body in terms of absorption, distribution, metabolism, and excretion:
| Route | Onset | Peak | Duration |
|---|---|---|---|
| PO | Gradual | 1.7 h | 18-36 h |
| Half-life (T1/2) | Metabolism | Excretion |
|---|---|---|
| 3.5 h | liver | urine |
Contraindications and Cautions
Allergy to any component, to prevent hypersensitivity reactions. Severe hypertension, heart failure, or cardiac disease, because of the resulting rise in blood pressure. Lactation, for potential effects on the baby. Infection, which can alter adrenal response. High sodium intake, which can produce severe hypernatremia.
Adverse Effects
- CNS: headache, weakness
- CV: edema, hypertension, heart failure
- Others: possible hypokalemia, allergic reactions from skin rash to anaphylaxis
Interactions
Salicylates, barbiturates, hydantoins, rifampin, and anticholinesterase agents lose effectiveness.
Nursing Considerations
Nursing Assessment
Check for contraindications and cautions (allergy, heart failure, hypertension) to avoid adverse effects. Get a baseline: blood pressure, pulse, adventitious breath sounds, weight, temperature, tissue turgor, reflexes and bilateral grip strength, and serum electrolytes.
Nursing Diagnoses and Care Planning
- Imbalanced nutrition: more than body requirements related to metabolic changes
- Excess fluid volume related to sodium retention
- Impaired urinary elimination related to sodium retention
Implementation with Rationale
Use only alongside appropriate glucocorticoids to keep electrolyte balance. Increase the dose during stress to prevent adrenal insufficiency and meet the higher corticosteroid demand. Monitor for hypokalemia (weakness, serum electrolytes) to catch and treat the loss early. Discontinue at signs of overdose (excessive weight gain, edema, hypertension) before toxicity worsens. Provide comfort measures, and teach drug effects and the warning signs to report.
Evaluation
Monitor response (electrolyte balance maintained), watch for adverse effects (fluid retention, edema, hypokalemia, headache), confirm the patient can name the drug, its indication, and adverse effects to watch for, and track compliance.
Frequently Asked Questions
Why must corticosteroids be tapered instead of stopped suddenly? Prolonged use suppresses the hypothalamic-pituitary-adrenal axis and the adrenal glands atrophy, so abruptly stopping leaves the body unable to make its own cortisol. That can trigger adrenal insufficiency or a life-threatening adrenal crisis, so the dose is lowered gradually to let the glands recover (Cleveland Clinic Journal of Medicine).
What time of day should glucocorticoids be given? Dose in the early morning, around 8 to 9 AM, to mimic the body's natural cortisol peak and minimize suppression of the HPA axis. When several doses are needed, space them through the day.
Why do steroids raise infection risk? Glucocorticoids suppress inflammation and immune activity, so they blunt the normal response to infection and can mask its early signs. Protect patients from unnecessary exposure and watch closely for subtle signs of infection (StatPearls).
What is the difference between glucocorticoids and mineralocorticoids? Glucocorticoids (such as prednisone and hydrocortisone) mainly reduce inflammation and suppress immunity, while mineralocorticoids (fludrocortisone) act on the kidney to retain sodium and water and excrete potassium. Some agents have both actions.
What signs suggest adrenal crisis? A patient with known adrenal insufficiency under major stress, infection, trauma, or surgery may show profound hypotension, shock, weakness, and collapse. It is an emergency treated with high-dose IV replacement steroids, fluids, and supportive care.
What are the major long-term risks of corticosteroid therapy? Chronic use can cause hyperglycemia, osteoporosis, weight gain and fluid retention, hypertension, cataracts, skin thinning, and increased infection risk, alongside HPA-axis suppression (StatPearls).