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# IV Hydrocortisone for Acute Asthma
## Overview
Hydrocortisone is a short-acting systemic corticosteroid used in acute asthma exacerbations to reduce airway inflammation. While oral prednisone/prednisolone is preferred for most patients who can tolerate enteral medications, IV hydrocortisone is utilized in severe exacerbations when the patient cannot swallow, has suspected malabsorption, or requires rapid onset in an ICU/ED setting.
## Primary Indications
* Acute severe asthma exacerbations unresponsive to initial intensive bronchodilator therapy.
* Patients unable to tolerate oral corticosteroids.
## Adult Dosing
* **Standard dose:** 100 mg IV every 6 to 8 hours.
* **Duration:** Continue until the patient can transition to oral corticosteroids or is stable for discharge (typically 3–5 days total course).
## Pediatric Dosing
* **Dose:** 2 mg/kg to 4 mg/kg per dose IV.
* **Frequency:** Every 6 hours.
* **Maximum:** 100 mg per dose.
* *Note: Always verify local institutional protocols as pediatric dosing guidelines vary.*
## Dose Adjustments
* **Renal/Hepatic:** No specific adjustment required for acute short-term use.
* **Chronic Corticosteroid Use:** Patients on long-term systemic steroids may require higher doses or careful tapering to prevent adrenal insufficiency.
## Contraindications
* Systemic fungal infections.
* Known hypersensitivity to hydrocortisone or formulation components.
* Avoid live vaccines during therapy.
## Adverse Effects
* **Common:** Hyperglycemia, hypertension, transient leukocytosis, agitation, anxiety, and insomnia.
* **Serious:** Hypokalemia, fluid retention, gastrointestinal ulceration/bleeding, and increased susceptibility to infection with prolonged use.
## Key Drug Interactions
* **CYP3A4 inducers (e.g., rifampin, phenytoin, carbamazepine):** May increase hydrocortisone clearance, potentially reducing efficacy.
* **NSAIDs:** Increased risk of gastrointestinal ulceration.
* **Diuretics:** Potential for additive hypokalemia.
* **Antidiabetic agents:** Reduced glycemic control requiring dose escalation.
## Monitoring
* **Clinical:** Respiratory rate, oxygen saturation, work of breathing, and peak flow measurements.
* **Laboratory:** Blood glucose levels (especially in patients with diabetes), baseline electrolytes (potassium), and signs of fluid overload or GI bleeding.
## Clinical Pearls
* **Transition:** Switch to the equivalent dose of oral prednisone/prednisolone as soon as the patient is able to tolerate oral intake.
* **Onset:** Systemic corticosteroids typically take 4–6 hours to show clinical improvement in airway obstruction.
* **Safety:** Hydrocortisone is preferred over dexamethasone in some institutions for short-term use due to its shorter duration of activity, which may simplify transition to oral therapy.
* **Guideline Variation:** Always refer to GINA (Global Initiative for Asthma) or NAEPP (National Asthma Education and Prevention Program) guidelines, acknowledging that specific institutional protocols regarding IV vs. oral or choice of corticosteroid agent may take precedence.
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*Disclaimer: This information is for educational purposes for healthcare professionals. Clinical practice varies by institution. Always verify dosages, contraindications, and drug interactions against institutional protocols and the most current prescribing information (e.g., FDA-approved product labels).*
