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# IV Hydrocortisone for Acute Asthma
## Overview
IV hydrocortisone is a corticosteroid used as an adjunct therapy in moderate to severe acute asthma exacerbations. It works by reducing airway inflammation, bronchoconstriction, and mucus production. Its onset of action is typically delayed, requiring several hours to provide significant benefit, and it is not a rescue medication for immediate symptom relief.
## Primary Indications
Adjunctive treatment for moderate to severe acute asthma exacerbations in patients who have not responded adequately to initial bronchodilator therapy.
## Adult Dosing
* **Initial Dose:** 100 mg IV every 6 to 8 hours.
* **Alternative:** Some protocols may recommend higher initial doses such as 200 mg IV once.
* Dosing is typically continued until improvement is seen, then transitioned to oral corticosteroids.
## Pediatric Dosing
* **Children 2 years and older:** 1 to 2 mg/kg/dose IV every 6 to 8 hours.
* **Maximum Dose:** Generally capped at 100 mg per dose, though some protocols may not specify a maximum.
## Dose Adjustments
No specific dose adjustments are routinely recommended for hepatic or renal impairment, but prolonged use may require consideration of adrenal suppression.
## Contraindications
* Known hypersensitivity to hydrocortisone or other corticosteroids.
* Systemic fungal infections.
## Adverse Effects
Common adverse effects are generally dose and duration-dependent and include hyperglycemia, fluid retention, mood changes, increased susceptibility to infection, and gastrointestinal upset. Acute, short-term IV use is less associated with significant long-term adverse effects.
## Key Drug Interactions
* **Antifungals (e.g., ketoconazole):** May decrease hydrocortisone metabolism, increasing levels.
* **CYP3A4 Inducers (e.g., rifampin, phenytoin):** May increase hydrocortisone metabolism, decreasing levels.
* **Diuretics (non-potassium sparing):** Increased risk of hypokalemia.
* **Insulin and oral antidiabetics:** Hydrocortisone can antagonize their effects, requiring dose adjustments.
## Monitoring
* Clinical response (symptomatic improvement, pulmonary function tests).
* Electrolytes (especially potassium with concurrent diuretic use).
* Blood glucose levels.
* Signs of infection.
## Clinical Pearls
* IV hydrocortisone is most effective when initiated early in the course of an exacerbation.
* It does not provide immediate bronchodilation and should be used in conjunction with inhaled beta-agonists and ipratropium.
* Transition to oral corticosteroids as soon as clinically appropriate to minimize risks associated with prolonged IV administration.
* The exact dosing regimen and duration may vary based on institutional protocols and patient response.
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*Disclaimer: This information is for educational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider and refer to the most current prescribing information or specific institutional protocols before making any treatment decisions.*
