Dexamethasone serves as an effective prophylactic measure against postoperative nausea and vomiting (PONV), comparable to ondansetron and droperidol in efficacy, with a relative risk (RR) of 0.76 versus placebo. It is particularly well-studied and commonly employed for PONV prophylaxis in pediatric patients. Apart from its direct antiemetic effect, dexamethasone also aids in reducing postoperative pain and the need for opioids, potentially enhancing its effectiveness. Studies suggest that lower doses of dexamethasone suffice for PONV prophylaxis compared to pain relief, with 4 to 5 mg IV demonstrating comparable efficacy to higher doses of 8 to 10 mg IV. However, higher doses may be necessary to reduce opioid requirements. Safety considerations necessitate individualized assessment, especially in diabetic patients as there is an anticipated modest increase in blood glucose levels. Administration of dexamethasone after induction rather than at the end of surgery is recommended due to its slow onset of action. For dosage recommendations:
- Adults: Administer 4 mg to 8 mg IV after induction.
- Children: Provide 0.25 mg/kg, with a maximum dose of 4 mg IV.
