Perioperative Glucocorticoid Use

Guideline Recommendations

The UK guidelines explicitly state that dexamethasone 6-8 mg IV can be used as an alternative to hydrocortisone for perioperative steroid coverage, indicating these agents are interchangeable in this context 1, 2
The Association of Anaesthetists, Royal College of Physicians, and Society for Endocrinology UK guidelines recommend that for major surgery, either hydrocortisone 100 mg at induction followed by continuous infusion OR dexamethasone 6-8 mg IV can be used, with dexamethasone providing sufficient coverage for 24 hours 1, 2, 3

The main consideration is not interaction but rather redundancy: if you already gave hydrocortisone 100 mg, adding dexamethasone may provide excessive glucocorticoid coverage unless there is a specific indication (such as antiemetic effect or prolonged coverage) 1, 2
If the indication for dexamethasone is for postoperative nausea/vomiting prophylaxis, this is reasonable as dexamethasone 8 mg has proven efficacy for this indication 4
Monitor for hyperglycemia, as the combined glucocorticoid load may be substantial, particularly in diabetic patients 1, 2