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# IV Dexamethasone ## Overview Dexamethasone is a potent, long-acting synthetic glucocorticoid with minimal mineralocorticoid activity. It is characterized by high anti-inflammatory and immunosuppressive potency and a long biological half-life (36–54 hours). ## Primary Indications * **Cerebral Edema:** Management of increased intracranial pressure associated with tumors, abscesses, or trauma. * **Anti-emetic:** Prevention of chemotherapy-induced or postoperative nausea and vomiting (CINV/PONV). * **Inflammatory/Allergic States:** Acute exacerbations of asthma, COPD, or severe allergic reactions. * **COVID-19:** Treatment of patients requiring supplemental oxygen or invasive mechanical ventilation. * **Croup:** Reduction of airway edema. ## Adult Dosing * **Cerebral Edema:** Initial 10 mg IV, followed by 4 mg IV every 6 hours. * **CINV Prophylaxis:** 8–20 mg IV once, depending on the emetogenic potential of the chemotherapy regimen. * **COVID-19:** 6 mg IV once daily for up to 10 days. * **Inflammatory Conditions:** 0.75–9 mg daily, divided every 6–12 hours, adjusted based on clinical response. ## Pediatric Dosing * **Croup:** 0.6 mg/kg IV/IM as a single dose (maximum 10 mg). * **COVID-19:** 0.15 mg/kg IV once daily (maximum 6 mg). * **Cerebral Edema:** 1–2 mg/kg loading dose, then 1–1.5 mg/kg/day divided every 4–6 hours (max dose depends on clinical protocol; consult institutional guidelines for neuro-surgical specific dosing). * **Anti-emetic:** 0.1–0.5 mg/kg (max 10–20 mg) depending on emetogenic risk. ## Dose Adjustments * **Hepatic Impairment:** No specific guidelines; use caution as metabolism may be prolonged. * **Renal Impairment:** No dose adjustment necessary. * **Geriatric:** Use the lowest effective dose for the shortest duration to avoid metabolic and neuropsychiatric complications. ## Contraindications * Systemic fungal infections. * Known hypersensitivity to dexamethasone or its components. * Avoid live or attenuated vaccines during immunosuppressive doses. ## Adverse Effects * **Metabolic:** Hyperglycemia (common, especially in diabetics), hypokalemia, fluid retention. * **Neuropsychiatric:** Insomnia, agitation, mood swings, psychosis. * **Gastrointestinal:** Peptic ulcer disease, dyspepsia, increased appetite. * **Infection:** Increased susceptibility to secondary infections (masked signs of sepsis). * **Long-term:** Adrenal suppression, osteoporosis, delayed wound healing. ## Key Drug Interactions * **CYP3A4 Inducers (e.g., Phenytoin, Rifampin, Carbamazepine):** Decrease dexamethasone efficacy. * **CYP3A4 Inhibitors (e.g., Ritonavir, Ketoconazole):** Increase dexamethasone systemic exposure and risk of toxicity. * **NSAIDs/Warfarin:** Increased risk of gastrointestinal ulceration/bleeding. * **Antidiabetic agents:** Dexamethasone antagonizes hypoglycemic control; insulin requirements may increase significantly. ## Monitoring * Serum glucose (daily in diabetics or those on prolonged therapy). * Blood pressure. * Electrolytes (potassium, sodium). * Signs of infection or gastrointestinal bleeding. * Neuropsychiatric status. ## Clinical Pearls * **Administration:** May be given slow IV push (usually over 1–5 minutes) or as an infusion. Verify local policy regarding concentration/dilution. * **Tapering:** While single doses (e.g., for croup or PONV) do not require tapering, patients on prolonged therapy (>1–2 weeks) must have the dose tapered to prevent adrenal crisis. * **Cerebral Edema:** Dexamethasone is effective for peritumoral edema, but efficacy in severe traumatic brain injury (TBI) is not supported by current clinical guidelines (CRASH trial). * **COVID-19:** The Benefit-Risk profile is highly dependent on oxygen status; it can be harmful if administered to patients not requiring supplemental oxygen. *** **EDUCATIONAL DISCLAIMER:** This information is for educational purposes only. Clinical practice varies by institution. Always verify dosages, contraindications, and drug compatibility through current institutional protocols, the package insert, or professional clinical references (e.g., Lexicomp, UpToDate) before prescribing or administering medication.