Stress Dose Prednisone
For minor stress (fever, infection, emotional stress), patients on prednisone should receive 10 mg total daily dose given in one or two divided doses; for moderate-to-major stress (surgery under general anesthesia, severe illness requiring hospitalization), parenteral glucocorticoids equivalent to hydrocortisone 100 mg IV are required. 1
Stress Stratification and Dosing Algorithm
The 2024 European Society of Endocrinology/Endocrine Society joint guideline provides the most current framework for stress dosing in patients with glucocorticoid-induced adrenal insufficiency 1:
Minor Stress
- Definition: Illness with fever, infection requiring antibiotics (outpatient), significant emotional stress, minor surgery with local anesthesia
- Dosing:
- Patients already taking prednisone ≥10 mg daily typically need no additional glucocorticoids
- Other patients: Prednisone 10 mg total daily dose (equivalent to hydrocortisone 40 mg), given in 1-2 divided doses
- Continue until stress resolves
Moderate-to-Major Stress
- Definition: Severe illness requiring hospital admission, major trauma, surgery under general/regional anesthesia, labor/delivery, cesarean section
- Dosing: Parenteral glucocorticoids required
- The 2020 UK guidelines recommend hydrocortisone 100 mg IV at surgery start, followed by 200 mg/24h infusion 2
- For prednisone equivalent: use parenteral methylprednisolone or dexamethasone at equivalent doses
- Continue until stress resolves
Vomiting/Diarrhea Without Hemodynamic Instability
- Consider parenteral glucocorticoids to prevent adrenal crisis due to reduced oral absorption 1
Suspected Adrenal Crisis
- Immediate treatment: Parenteral glucocorticoids plus fluid resuscitation, regardless of current glucocorticoid dose or type 1
Critical Clinical Considerations
Important caveat: The guidelines acknowledge that "practices vary considerably among centers and lower doses are also routinely used" for moderate/major stress 1. However, given the mortality risk of adrenal crisis (documented deaths in prospective studies 2) and the 8.3 per 100 patient-years incidence of adrenal crisis 2, err on the side of higher dosing during significant physiologic stress.
Who Needs Stress Dosing?
Any patient receiving prednisone ≥5 mg daily for >1 month is at risk for HPA axis suppression 2. The FDA label confirms that "patient exposure to stressful situations not directly related to the disease entity under treatment may necessitate increasing the dosage of prednisone for a period of time" 3.
Common Pitfalls to Avoid
Don't rely on biochemical testing during acute stress: Adrenal crisis can occur even with normal or elevated plasma cortisol levels (concept of "relative adrenal insufficiency") 2
Don't abruptly stop glucocorticoids perioperatively: Continue at minimum the usual daily dose; stopping 36-48 hours before surgery has resulted in unexplained hypotension 4
Don't undertaper during stress: Patients on therapeutic doses (not replacement) who continue their usual daily dose generally do well 4, but additional stress dosing is still recommended by current guidelines for those at risk of adrenal insufficiency
Recognize the distinction: Patients on therapeutic doses for disease management may not need stress dosing if continuing their usual dose (which may already be supraphysiologic) 4, versus patients with glucocorticoid-induced adrenal insufficiency who require stress dosing 1
Post-Stress Recovery
After uncomplicated recovery from moderate-to-major stress, double the regular oral replacement dose for 48 hours to 1 week before resuming maintenance dosing 2. If the patient remains critically ill, continue parenteral stress dosing 1.