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## Dexamethasone Injection
### Overview
Dexamethasone is a potent synthetic corticosteroid with strong anti-inflammatory and immunosuppressive effects. It is available as a solution for intravenous, intramuscular, subcutaneous, and intra-articular administration.
### Primary Indications
* Allergic states
* Dermatologic diseases
* Endocrine disorders
* Gastrointestinal diseases
* Hematologic disorders
* Neoplastic diseases (adjunctive therapy)
* Nervous system (edema associated with brain tumors)
* Ophthalmic diseases
* Renal diseases
* Respiratory diseases
* Rheumatic disorders
* Organ transplant rejection prevention
### Adult Dosing
Dosing is highly variable depending on the condition and severity. Typical intravenous doses range from **1 mg to 20 mg daily**. Higher doses may be used for specific indications (e.g., cerebral edema, septic shock). Doses are often tapered as symptoms improve. Consult institutional protocols for specific indications.
### Pediatric Dosing
Dosing is also highly variable and based on severity of the condition and the child's weight. Typical doses range from **0.08 mg/kg/day to 0.3 mg/kg/day divided every 6 to 12 hours**. Alternatively, **0.275 mg/kg/day to 1.1 mg/kg/day divided every 3 to 4 days**. Consult institutional protocols for specific indications.
### Dose Adjustments
No specific dose adjustments are routinely recommended for hepatic or renal impairment. However, caution and close monitoring are advised, as corticosteroids can exacerbate underlying conditions.
### Contraindications
* Systemic fungal infections
* Known hypersensitivity to dexamethasone or other corticosteroids
### Adverse Effects
Common adverse effects include hyperglycemia, insomnia, mood changes, increased appetite, fluid retention, and increased susceptibility to infection. Long-term use can lead to Cushingoid features, osteoporosis, peptic ulcers, adrenal suppression, and growth retardation in children.
### Key Drug Interactions
* **CYP3A4 inducers** (e.g., rifampin, phenytoin, carbamazepine): May decrease dexamethasone levels.
* **CYP3A4 inhibitors** (e.g., ketoconazole, itraconazole): May increase dexamethasone levels.
* **Diuretics** (non-potassium sparing): May increase risk of hypokalemia.
* **Vaccines**: Live vaccines should be avoided; efficacy of inactivated vaccines may be reduced.
### Monitoring
* Blood glucose levels
* Electrolytes (especially potassium)
* Signs and symptoms of infection
* Signs and symptoms of adrenal suppression (especially during tapering or withdrawal)
* Bone mineral density (with chronic use)
* Growth and development (in children)
### Clinical Pearls
* Dexamethasone is a very potent corticosteroid with a long half-life.
* Sudden discontinuation after prolonged use can precipitate adrenal insufficiency. Tapering is essential.
* Administer with food or milk to minimize gastrointestinal upset.
* Consider prophylactic measures for opportunistic infections in immunosuppressed patients.
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**Disclaimer:** This information is intended for healthcare professionals and should not replace professional medical advice. Always consult the most current prescribing information and relevant guidelines before making any treatment decisions.
