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# IV Hydrocortisone for Acute Asthma
## Overview
Intravenous hydrocortisone is a corticosteroid used as adjunctive therapy in moderate to severe acute asthma exacerbations. It works by reducing airway inflammation. Its onset of action is delayed, typically requiring several hours to demonstrate clinical benefit.
## Primary Indications
Adjunctive treatment of moderate to severe acute asthma exacerbations unresponsive to initial bronchodilator therapy.
## Adult Dosing
* **Initial Dose:** 100 mg IV every 6 to 8 hours.
* **Alternative Loading Dose:** Some protocols may use a higher loading dose of 200 mg IV.
* **Continuous Infusion:** 200 mg IV over 24 hours.
*Note: Specific dosing frequency and duration depend on patient response and local protocol.*
## Pediatric Dosing
* **Age < 3 months:** Not established. Use with caution and lower doses if necessary.
* **Age 3 months to 17 years:** 1 to 2 mg/kg/dose IV every 6 to 8 hours.
* **Maximum Dose:** Generally 100 mg per dose.
*Note: Dosing in neonates and infants requires careful consideration due to immature metabolic pathways. Consult pediatric specific guidelines.*
## Dose Adjustments
No specific dose adjustments are typically required for hepatic or renal impairment, but caution is advised in severe disease.
## Contraindications
Systemic fungal infections. Known hypersensitivity to hydrocortisone or other components of the formulation.
## Adverse Effects
* **Common:** Hyperglycemia, fluid retention, electrolyte imbalances (hypokalemia), mood changes, insomnia, increased susceptibility to infection.
* **Less Common:** Adrenal suppression, peptic ulceration, osteoporosis (with prolonged use), Cushingoid appearance (with prolonged use).
## Key Drug Interactions
* **CYP3A4 inducers (e.g., rifampin, phenytoin, carbamazepine):** May decrease hydrocortisone levels.
* **CYP3A4 inhibitors (e.g., ketoconazole, macrolides):** May increase hydrocortisone levels.
* **Diuretics (potassium-depleting):** Increased risk of hypokalemia.
* **Antidiabetic agents:** May require increased doses due to hyperglycemia.
* **Live vaccines:** Reduced immune response, increased risk of death from vaccine.
## Monitoring
* Blood glucose levels.
* Electrolytes (especially potassium).
* Signs of infection.
* Clinical response (respiratory rate, oxygen saturation, peak expiratory flow rate, subjective dyspnea).
* Adrenal function (if therapy is prolonged or interrupted).
## Clinical Pearls
* IV hydrocortisone is most effective when initiated early in the management of moderate to severe exacerbations.
* Onset of benefit is delayed (may take 4-6 hours or longer). Do not rely on IV hydrocortisone alone for immediate bronchodilation; continue aggressive short-acting beta-agonist (SABA) therapy.
* Transition to oral corticosteroids once the patient is stable and able to tolerate oral intake.
* Short courses of parenteral corticosteroids for acute asthma exacerbations are generally associated with a lower risk of significant adrenal suppression compared to long-term use.
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*Disclaimer: This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and institutional guidelines before administering any medication. Dosing and recommendations may vary.*
