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# IV Hydrocortisone for Acute Asthma
## Overview
Intravenous hydrocortisone is a corticosteroid used as adjunctive therapy in severe acute asthma exacerbations. It works by reducing airway inflammation, bronchoconstriction, and mucus production.
## Primary Indications
Adjunctive treatment for severe acute asthma exacerbations unresponsive to initial bronchodilator therapy.
## Adult Dosing
* **Loading Dose:** 100 mg IV every 6-8 hours.
* **Continuous Infusion:** 200 mg IV over 24 hours (may be used in some protocols).
* Dosing often transitions to oral corticosteroids once the patient can tolerate oral intake and symptoms improve.
*Note: Specific dosing frequency and duration may vary based on institutional protocols and patient response.*
## Pediatric Dosing
* **Loading Dose:** 1-2 mg/kg IV every 6-8 hours, with a maximum of 100 mg per dose.
* Dosing is often weight-based and may vary by age group; consult pediatric guidelines.
*Note: Titration based on clinical response is crucial. Transition to oral corticosteroids when clinically appropriate.*
## Dose Adjustments
No specific dose adjustments are routinely required for renal or hepatic impairment, but caution and closer monitoring are advised in severe cases.
## Contraindications
* Known hypersensitivity to hydrocortisone or other corticosteroids.
* Systemic fungal infections.
## Adverse Effects
Common adverse effects can include hyperglycemia, fluid retention, electrolyte imbalances (hypokalemia), insomnia, and mood changes. With short-term IV use, severe side effects are less common but may include increased risk of infection, peptic ulceration, and adrenal suppression (especially with prolonged or high-dose use).
## Key Drug Interactions
* **CYP3A4 Inducers (e.g., rifampin, phenytoin, phenobarbital):** May decrease hydrocortisone efficacy.
* **CYP3A4 Inhibitors (e.g., ketoconazole, macrolides):** May increase hydrocortisone levels.
* **Diuretics (non-potassium-sparing):** Increased risk of hypokalemia.
* **Antidiabetic agents:** May decrease efficacy, requiring increased dosage of these agents.
## Monitoring
* Blood glucose levels.
* Electrolyte levels (especially potassium).
* Signs of infection.
* Clinical response (respiratory rate, oxygen saturation, use of accessory muscles, subjective improvement in dyspnea).
* Blood pressure and fluid status.
## Clinical Pearls
* IV corticosteroids are generally considered most effective when administered early in the course of a severe asthma exacerbation.
* Onset of action may take several hours (4-6 hours or longer) for significant clinical benefit.
* Do not discontinue abruptly if prolonged therapy is anticipated.
* Hydrocortisone is a "like-for-like" replacement for endogenous cortisol and has both glucocorticoid and mineralocorticoid activity.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines before administering any medication. This information does not replace professional medical advice.*
