Prefer Hydrocortisone Over Other Glucocorticoids in Pregnancy; Avoid Dexamethasone
STEP 1 — Gather Information
Confirm pregnancy status, diagnose primary adrenal insufficiency (PAI) via clinical symptoms and biochemical testing (e.g., low morning cortisol, elevated ACTH, abnormal cosyntropin stimulation test), and assess the need for glucocorticoid replacement therapy.
STEP 2 — Rule In / Rule Out
Is the patient pregnant with confirmed PAI requiring glucocorticoid replacement? If yes, proceed to glucocorticoid selection; if no, follow standard non‑pregnant PAI glucocorticoid guidelines.
STEP 3 — Classify or Stratify
Classify glucocorticoid options: preferred – hydrocortisone; acceptable alternatives – cortisone acetate, prednisolone, or prednisone; contraindicated – dexamethasone (due to placental transfer risk).
STEP 4 — Decide
Prescribe hydrocortisone as the first‑line glucocorticoid; avoid dexamethasone entirely; if hydrocortisone is unavailable, use cortisone acetate, prednisolone, or prednisone; reserve dexamethasone only for extreme circumstances when no other glucocorticoid is accessible.
Clinical Guardrails / Mimics / Pitfalls
Do not use dexamethasone in pregnancy because it crosses the placenta unchanged, risking fetal overexposure; avoid long‑acting glucocorticoids that complicate stress dosing; monitor for signs of over‑ or under‑replacement (weight gain, hypertension, fatigue, postural hypotension) and adjust doses, especially increasing hydrocortisone by 20‑40% from the 24th week onward; ensure patients have a steroid emergency card and know stress‑dosing rules for illness or labor.
Concrete Clinical Example
A 32‑year‑old woman at 28 weeks gestation presents with fatigue, nausea, and hypotension; morning cortisol is 80 nmol/L and ACTH is 6‑fold upper limit, confirming PAI. She is started on hydrocortisone 20 mg daily (10 mg on waking, 10 mg early afternoon) and fludrocortisone 100 µg daily; dexamethasone is explicitly avoided despite her requesting a once‑daily regimen.
Source: Diagnosis and Treatment of Primary Adrenal Insufficiency: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2016, DOI:10.1210/jc.2015-1710