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# IV Dexamethasone
## Overview
Dexamethasone is a potent, long-acting synthetic glucocorticoid with minimal mineralocorticoid activity. It provides profound anti-inflammatory and immunosuppressive effects.
## Primary Indications
* Cerebral edema (associated with brain tumors, neurosurgery, or abscess).
* Severe allergic reactions or anaphylaxis (adjunctive).
* Croup (pediatric).
* COVID-19 (severe respiratory distress requiring oxygen).
* Antiemetic prophylaxis (chemotherapy-induced nausea and vomiting).
* Bacterial meningitis (adjunctive to decrease inflammation).
## Adult Dosing
* **Cerebral Edema:** Initial 10 mg IV, followed by 4 mg IV every 6 hours.
* **COVID-19:** 6 mg IV once daily for up to 10 days.
* **CINV Prophylaxis:** 8–20 mg IV as a single dose before chemotherapy.
* **Anaphylaxis/Severe Allergy:** 4–20 mg IV as a single dose.
* **Bacterial Meningitis:** 10 mg IV every 6 hours for 4 days (ideally given with or just before the first antibiotic dose).
## Pediatric Dosing
* **Croup:** 0.6 mg/kg IV/IM as a single dose (max 10 mg).
* **Bacterial Meningitis:** 0.15 mg/kg IV every 6 hours for 4 days.
* **Cerebral Edema:** Loading dose 1–2 mg/kg IV, followed by 1–1.5 mg/kg/day divided every 4–6 hours.
* *Note: Always verify doses against weight-based institutional protocols for critical care applications.*
## Dose Adjustments
* **Hepatic Impairment:** Clearance may be decreased; monitor closely for increased side effects.
* **Renal Impairment:** No specific adjustment required; however, steroid-induced fluid retention may exacerbate existing renal issues.
## Contraindications
* Systemic fungal infections.
* Hypersensitivity to dexamethasone or any component of the formulation.
* Live virus vaccines (when on immunosuppressive doses).
## Adverse Effects
* **Metabolic:** Hyperglycemia, fluid retention, hypokalemia.
* **Gastrointestinal:** Peptic ulcer disease, GI bleeding.
* **Psychiatric:** Insomnia, mood swings, psychosis, agitation.
* **Infection:** Increased risk of opportunistic infections with prolonged use.
* **Dermatologic:** Impaired wound healing.
## Key Drug Interactions
* **CYP3A4 Inducers (e.g., Rifampin, Phenytoin, Carbamazepine):** Decrease dexamethasone efficacy.
* **Warfarin:** May increase or decrease INR; monitor closely.
* **NSAIDs:** Increased risk of gastrointestinal ulceration/bleeding.
* **Antidiabetic Agents:** May require increased doses due to steroid-induced hyperglycemia.
## Monitoring
* Blood glucose (especially in diabetic patients).
* Blood pressure.
* Electrolytes (potassium, sodium).
* Signs/symptoms of infection.
* GI discomfort or frank bleeding (melena/hematemesis).
## Clinical Pearls
* **Administration:** IV push is typically administered over 1–5 minutes.
* **Hyperglycemia:** Even non-diabetic patients may experience significant glucose spikes; prophylactic insulin protocols may be necessary in hospitalized patients receiving high doses.
* **Tapering:** While single doses or short courses (e.g., < 5 days) usually do not require a taper, prolonged therapy requires gradual withdrawal to prevent adrenal insufficiency.
* **Brain Injury:** Dexamethasone is **not** indicated or recommended in patients with traumatic brain injury (TBI) due to potential for increased mortality.
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**Educational Disclaimer:** This information is for educational purposes only. Clinical practice varies by institution. Always consult your current institutional protocols, the drug package insert, and clinical decision support tools (e.g., Lexicomp, Micromedex) before prescribing or administering medication.
