Addison's disease (primary adrenal insufficiency) is a rare but potentially life-threatening CDL condition in which the adrenal glands fail to produce sufficient cortisol and aldosterone. With correct diagnosis and appropriate replacement therapy, people with Addison's disease live normal lives. The medical aid picture is straightforward in stable disease — and critically important in an adrenal crisis.
What Is Addison's Disease?
Addison's disease results from destruction or dysfunction of the adrenal cortex. Common causes in SA include autoimmune adrenalitis (most common globally) and tuberculosis adrenalitis (clinically important in the SA context). Bilateral adrenal metastases, haemorrhage, fungal infection, and infiltrative conditions are rarer causes.
Key hormones that are deficient: - Cortisol (glucocorticoid): Essential for the stress response, immune regulation, blood pressure maintenance, and glucose homeostasis. - Aldosterone (mineralocorticoid): Regulates sodium and potassium balance and blood volume. Without it: salt-wasting, hypotension, hyperkalaemia. - DHEA (adrenal androgen): Reduced; contributes to fatigue and mood symptoms, particularly in women.
Classical presenting symptoms include persistent fatigue, weight loss, hyperpigmentation (darkening of skin creases, buccal mucosa, scars, and new pressure areas), postural hypotension, salt craving, nausea, vomiting, and abdominal pain. These may develop gradually over months before diagnosis. A triggering event (illness, surgery, physical stress) can precipitate an acute adrenal crisis before the diagnosis is established.
CDL Coverage
Addison's disease is a CDL condition. Your scheme must fund hydrocortisone (glucocorticoid replacement) and fludrocortisone (mineralocorticoid replacement) from the CDL benefit indefinitely. These medications are inexpensive — the financial challenge in Addison's disease is not chronic medication cost but rather the emergency risk of an adrenal crisis and the less common complication of a hospitalisation event.
Treatment
Glucocorticoid replacement — Hydrocortisone: Hydrocortisone is the preferred glucocorticoid. Its short half-life allows dosing that approximates the natural cortisol circadian rhythm: a larger morning dose (two-thirds of total daily dose) and a smaller afternoon dose. Typical daily dose: 15–25mg in 2 divided doses. Modified-release hydrocortisone formulations (once-daily) are available but not universally funded in SA.
Mineralocorticoid replacement — Fludrocortisone (Florinef): Fludrocortisone replaces aldosterone. Typical dose: 50–150 micrograms/day. Without adequate fludrocortisone, patients develop salt-wasting, postural hypotension, and potentially dangerous hyperkalaemia.
Sick day rules — Non-negotiable patient education: Every person with Addison's disease must know the sick day rules and act on them: - Mild illness (cold, low-grade fever): double the hydrocortisone dose until recovered. - Significant illness (high fever, flu, vomiting): triple the dose. If vomiting prevents oral intake, administer the emergency IM hydrocortisone injection immediately. - Major surgery or procedures requiring anaesthesia: perioperative IV hydrocortisone is mandatory — the anaesthesiologist and surgeon must be informed of the diagnosis before any procedure.
DHEA supplementation: Some endocrinologists prescribe DHEA (dehydroepiandrosterone) for women with Addison's disease to address adrenal androgen deficiency — contributing to improvements in energy, mood, and sexual function. Coverage under the CDL benefit varies by scheme.
Medication Costs
Estimated; SAHPRA SEP verification pending.
| Medication | Estimated Monthly Cost |
|---|---|
| Hydrocortisone (daily replacement) | R250–R350 |
| Fludrocortisone (Florinef) | R200–R300 |
| Emergency IM hydrocortisone 100mg kit | ~R400–R600 (replaced annually or after use) |
Fludrocortisone supply note: Florinef has experienced intermittent supply disruptions in SA. Maintain a 2–3 month buffer stock. If supply is disrupted, contact your endocrinologist and consider specialist pharmacies that can source imported alternatives.
Annual Cost Estimates
| Scenario | Estimated Annual Cost |
|---|---|
| Stable, compliant, no crises | R6,000 – R18,000 |
| Year with intercurrent illness (dose escalation, extra visits) | R15,000 – R35,000 |
| Adrenal crisis requiring emergency admission (fluids, IV hydrocortisone, ICU observation) | R40,000 – R80,000 |
The Adrenal Crisis: Life-Threatening Emergency
An adrenal crisis is precipitated by any physiological stress in an inadequately replaced patient — severe illness, surgery, vomiting (preventing oral hydrocortisone), trauma, or extreme heat. Presentation: profound weakness, severe hypotension, nausea, vomiting, confusion, collapse, and cardiovascular shock.
Immediate treatment: IM or IV hydrocortisone 100mg; IV 0.9% saline resuscitation; hospitalisation. Without treatment, an adrenal crisis can be fatal within hours.
Medical aid coverage: Adrenal crisis is a PMB emergency. The scheme cannot refuse emergency hospitalisation, IV hydrocortisone, or ICU observation for haemodynamic monitoring.
The MedicAlert bracelet: Every person with Addison's disease should wear a MedicAlert bracelet engraved with: "Addison's Disease — Needs Hydrocortisone." This communicates the diagnosis and immediate treatment requirement to emergency responders when the patient cannot communicate. Cost: approximately R300–R600 (one-time purchase).
Gap Cover Relevance
Addison's disease is primarily an outpatient, low-medication-cost CDL condition in the stable phase. Gap cover is most relevant for endocrinologist consultation shortfalls and, in the event of adrenal crisis, emergency specialist fees. The financial risk is low-frequency but potentially high-severity if an acute crisis requires ICU-level care.
Comorbid Autoimmune Conditions
Addison's disease rarely travels alone. The autoimmune form (autoimmune polyglandular syndrome, APS) is associated with increased risk of other autoimmune conditions — most importantly Hashimoto's thyroiditis (autoimmune hypothyroidism), Type 1 diabetes, and coeliac disease. Annual thyroid screening (TSH) is recommended for all patients with autoimmune Addison's. These comorbidities, if present, carry their own CDL implications and should be registered separately with the scheme.
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This page is general information about medical schemes. It is not medical advice: speak to a healthcare professional about your own treatment. Medical aid and gap cover advice is given by Eldon de Waal, a Supervised Representative of Approach Administration (FSP 23579).