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# IV Dexamethasone
## Overview
Dexamethasone is a potent synthetic corticosteroid with anti-inflammatory and immunosuppressive effects.
## Primary Indications
* Management of severe allergic reactions
* Adjunctive therapy for bacterial meningitis
* Treatment of cerebral edema
* Management of adrenal insufficiency
* Treatment of nausea and vomiting associated with chemotherapy
* Management of certain inflammatory and autoimmune conditions
## Adult Dosing
Dosing is highly variable depending on the indication.
* **Allergic reactions:** 4-12 mg IV once, may repeat q12h.
* **Bacterial meningitis:** 0.15 mg/kg IV q6h for 4 days, initiated before or with the first dose of antibiotics. Maximum 16 mg/dose.
* **Cerebral edema:** 10 mg IV once, followed by 4 mg IV q6h. Dose may be tapered based on clinical response.
* **Chemotherapy-induced nausea/vomiting:** 10-20 mg IV once before chemotherapy, may be combined with other antiemetics.
* **Adrenal insufficiency:** 4-12 mg IV once daily.
## Pediatric Dosing
Dosing is weight-based and indication-specific.
* **Bacterial meningitis:** 0.15 mg/kg IV q6h for 4 days, initiated before or with the first dose of antibiotics. Maximum 16 mg/dose.
* Dosing for other indications should be guided by pediatric endocrinology or infectious disease specialists and may depend on local protocols.
## Dose Adjustments
No specific dose adjustments for renal or hepatic impairment are established, but caution and clinical monitoring are advised due to potential for altered metabolism and increased adverse effects.
## Contraindications
* Systemic fungal infections
* Hypersensitivity to dexamethasone or other corticosteroids
## Adverse Effects
Common adverse effects include hyperglycemia, insomnia, mood changes, increased appetite, fluid retention, hypertension, immunosuppression, and increased risk of infection. Long-term use can lead to Cushingoid features, osteoporosis, adrenal suppression, and growth suppression in children.
## Key Drug Interactions
* **CYP3A4 inducers (e.g., phenytoin, rifampin, carbamazepine):** May decrease dexamethasone efficacy.
* **CYP3A4 inhibitors (e.g., ketoconazole, ritonavir):** May increase dexamethasone levels and toxicity.
* **Antidiabetics:** Hyperglycemia may necessitate adjustment of antidiabetic medications.
* **Diuretics (non-potassium-sparing):** Increased risk of hypokalemia.
* **Live vaccines:** Increased risk of disseminated infection.
## Monitoring
* Blood glucose levels
* Electrolytes (especially potassium)
* Signs of infection
* Blood pressure
* Signs of Cushingoid effects with prolonged use
* Growth in pediatric patients
## Clinical Pearls
* Administer IV dexamethasone slowly to avoid adverse reactions.
* Avoid abrupt discontinuation, especially after prolonged use, due to risk of adrenal insufficiency. Taper dose gradually.
* May be given intramuscularly or orally for extended therapy.
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*Disclaimer: This information is intended for educational purposes and does not substitute for professional medical advice. Always consult the most current prescribing information and your healthcare provider for any medical decisions.*
