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# Intravenous Hydrocortisone for Acute Asthma
## Overview
Intravenous (IV) hydrocortisone is a systemic corticosteroid used as an adjunct therapy in moderate to severe acute asthma exacerbations that do not adequately respond to initial treatment with inhaled bronchodilators. It works by reducing airway inflammation.
## Primary Indications
Adjunctive treatment for moderate to severe acute asthma exacerbations.
## Adult Dosing
* **Dose:** 100 mg IV every 6 to 8 hours. Some protocols may suggest higher doses or bolus administration.
* **Maximum:** Not definitively established for acute asthma, but doses exceeding 200 mg every 6 hours are generally not recommended without specific indication.
## Pediatric Dosing
* **Dose:** 1 mg/kg IV every 6 hours, not to exceed 100 mg per dose.
* **Note:** Dosing may vary based on age and severity, and specific institutional protocols should be consulted.
## Dose Adjustments
No dose adjustments are typically required for renal or hepatic impairment, although prolonged use may require liver function monitoring.
## Contraindications
* Hypersensitivity to hydrocortisone or other corticosteroids.
* Active systemic fungal infections.
* Live virus vaccinations.
## Adverse Effects
Common adverse effects with short-term IV use include hyperglycemia, fluid retention, electrolyte imbalances (hypokalemia), insomnia, and mood changes. Longer-term or high-dose use can lead to more serious effects like immunosuppression, Cushingoid effects, osteoporotic bone changes, and adrenal suppression.
## Key Drug Interactions
* **Potent CYP3A4 inhibitors (e.g., ketoconazole, ritonavir):** May increase hydrocortisone levels.
* **CYP3A4 inducers (e.g., rifampin, carbamazepine, phenytoin):** May decrease hydrocortisone levels.
* **Diuretics (e.g., thiazides, loop diuretics):** Increased risk of hypokalemia.
* **Vaccines:** Live vaccines are contraindicated. Live attenuated vaccines may have reduced immunogenicity.
## Monitoring
* Blood glucose levels.
* Electrolyte levels (especially potassium).
* Signs and symptoms of infection.
* Clinical response to therapy (respiratory rate, oxygen saturation, wheezing).
* Adrenal function (if prolonged use is anticipated).
## Clinical Pearls
* IV hydrocortisone is most effective when administered early in the management of severe asthma exacerbations, ideally within the first hour of presentation, though evidence for this specific timing is debated.
* It is generally considered less potent than IV methylprednisolone, but may be preferred in certain situations or institutional formularies.
* The benefit of IV corticosteroids in mild-to-moderate asthma exacerbations treated with inhaled therapy alone is less clear.
* Transition to oral corticosteroids once the patient can tolerate oral intake and clinical improvement is noted.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols before administering any medication.
