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# Intravenous Dexamethasone
## Overview
Dexamethasone is a potent synthetic corticosteroid with anti-inflammatory and immunosuppressive effects. It has a long duration of action.
## Primary Indications
* Allergic states
* Dermatologic diseases
* Endocrine disorders
* Gastrointestinal diseases
* Hematologic disorders
* Neoplastic conditions (e.g., treatment of cerebral edema associated with tumors)
* Nervous system conditions (e.g., multiple sclerosis exacerbations)
* Ophthalmic diseases
* Renal diseases
* Respiratory diseases
* Rheumatic disorders
* Aspiration pneumonitis
* Certain infections (adjunctive therapy, e.g., tuberculous meningitis)
## Adult Dosing
* **General Dosing:** Widely variable depending on the indication. Doses typically range from **1.5 mg to 24 mg daily**, administered intravenously in single or divided doses.
* **Cerebral Edema:** Often initiated at **10 mg IV**, followed by **4 mg IV every 6 hours**. Duration depends on response and etiology, typically tapered off.
* **Acute Adrenal Insufficiency:** **6 mg to 12 mg IV** once daily.
* **Allergic/Inflammatory Conditions:** **4 mg to 16 mg IV** every 6 to 12 hours.
* **Dose Maximum:** No defined maximum dose; dosing is highly individualized.
## Pediatric Dosing
* Dosing is highly individualized and based on the severity of the condition and patient weight. Consult specific pediatric guidelines or institutional protocols.
* **General Range:** Typically **0.08 mg/kg to 0.3 mg/kg per day** divided every 6 to 12 hours.
* **Maximum:** No defined maximum dose.
## Dose Adjustments
* **Renal Impairment:** No specific dose adjustment is typically recommended, but prolonged use should be monitored closely due to potential for fluid retention.
* **Hepatic Impairment:** No specific dose adjustment is typically recommended, but monitor for increased corticosteroid effects.
## Contraindications
* Systemic fungal infections
* Known hypersensitivity to dexamethasone or other components of the formulation.
## Adverse Effects
* **Common:** Hyperglycemia, insomnia, mood changes (euphoria, depression), increased appetite, fluid retention, hypertension, increased susceptibility to infection.
* **Serious:** Adrenal suppression, Cushingoid appearance, peptic ulceration, osteoporosis, myopathy, psychiatric disturbances, glaucoma, cataracts, impaired wound healing, growth retardation (in children).
## Key Drug Interactions
* **CYP3A4 Inducers (e.g., rifampin, phenytoin, carbamazepine, ephedrin):** May increase dexamethasone clearance, requiring increased doses.
* **CYP3A4 Inhibitors (e.g., ketoconazole, itraconazole):** May decrease dexamethasone clearance, requiring decreased doses.
* **Diuretics (potassium-depleting):** Increased risk of hypokalemia.
* **Antidiabetics (oral and insulin
