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# Acetylcysteine
## Overview
Acetylcysteine is a mucolytic agent and an antidote for acetaminophen overdose.
## Primary Indications
* **Acetaminophen Overdose:** To prevent or reduce liver toxicity.
* **Mucolytic:** To thin and loosen mucus in the airways, facilitating expectoration in conditions like cystic fibrosis, bronchitis, and COPD.
## Adult Dosing
* **Acetaminophen Overdose:**
* **Loading Dose:** 150 mg/kg IV infused over 1 hour.
* **Second Dose:** 50 mg/kg IV infused over 16 hours.
* **Third Dose:** 50 mg/kg IV infused over 16 hours (if needed, based on acetaminophen levels and clinical status).
* Alternative oral protocol exists and is often preferred if the patient can tolerate oral administration. Specific oral dosing depends on local protocol.
* **Mucolytic:**
* **Nebulization:** 3 mL of a 10% or 20% solution, or 6 mL of a 10% solution, nebulized every 3-4 hours. Some protocols may use up to 10 mL of 10% solution.
* **Oral:** 200 mg orally twice daily, or 600 mg orally once daily.
## Pediatric Dosing
* **Acetaminophen Overdose (IV):** Dosing is based on weight, following the same regimen as adults (150 mg/kg loading dose, then 50 mg/kg every 16 hours).
* **Mucolytic (Nebulization):** 1-3 mL of a 10% or 20% solution nebulized every 3-4 hours.
* **Mucolytic (Oral):** 50-100 mg/kg/day divided into 2-4 doses, not to exceed 600 mg/day.
## Dose Adjustments
No specific dose adjustments are typically required for hepatic or renal impairment, but caution is advised in severe cases.
## Contraindications
* Hypersensitivity to acetylcysteine.
* Active gastrointestinal bleeding (for oral administration).
## Adverse Effects
* **IV:** Anaphylactoid reactions (rash, urticaria, bronchospasm, angioedema), flushing, hypotension, tachycardia.
* **Nebulized:** Bronchospasm (especially in patients with asthma), stomatitis, nausea, vomiting.
* **Oral:** Nausea, vomiting, diarrhea, rash.
## Key Drug Interactions
* **Activated Charcoal:** May adsorb oral acetylcysteine, reducing its efficacy. Administer oral acetylcysteine at least 1 hour after activated charcoal.
* **Nitroglycerin:** May potentiate the vasodilatory effects, leading to additive hypotension.
## Monitoring
* **Acetaminophen Overdose:** Serum acetaminophen levels, liver function tests (AST, ALT, bilirubin, INR), prothrombin time, glucose, and renal function.
* **Mucolytic:** Respiratory status, sputum production, and presence of bronchospasm.
## Clinical Pearls
* For IV administration, slow infusion is crucial to minimize anaphylactoid reactions. Pretreatment with an antihistamine may be considered.
* Oral acetylcysteine can be mixed with juice or other beverages to mask the unpleasant sulfurous odor and taste.
* Bronchospasm with nebulized acetylcysteine can be managed with concurrent bronchodilator therapy.
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*Disclaimer: This information is intended for clinical use and is not a substitute for professional medical advice. Always consult the most current prescribing information and relevant guidelines for definitive patient care decisions.*
