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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 Agent:** To thin and loosen mucus in respiratory conditions.
## Adult Dosing
**Acetaminophen Overdose:**
* **Loading Dose:** 150 mg/kg IV over 1 hour.
* **Second Dose:** 50 mg/kg IV over 4 hours.
* **Third Dose:** 100 mg/kg IV over 16 hours.
* Total daily dose should not exceed 150 mg/kg.
* A continuous infusion may be used if unable to administer IV boluses.
* Maximum IV infusion rate generally not to exceed 15 g/hr.
**Mucolytic Agent:**
* **Nebulized:** 20% solution: 1-10 mL every 2-6 hours. 10% solution: 5-20 mL every 2-6 hours.
* **Oral:** 600 mg once daily or divided into 2-3 doses.
## Pediatric Dosing
**Acetaminophen Overdose:**
* Dosing is based on weight (150 mg/kg loading, 50 mg/kg second dose, 100 mg/kg third dose) as described in adult dosing.
* Oral administration is an alternative in children, especially if intravenous access is difficult.
**Mucolytic Agent:**
* **Nebulized:**
* Neonates: 1-2 mL of 10% or 20% solution every 2-6 hours.
* Children: 1-10 mL of 20% solution or 5-20 mL of 10% solution every 2-6 hours.
* **Oral:** 600 mg once daily or divided into 2-3 doses.
## Dose Adjustments
* **Renal Impairment:** No specific dose adjustment is typically recommended for IV or nebulized acetylcysteine, but caution is advised.
* **Hepatic Impairment:** No specific dose adjustment is typically recommended for IV or nebulized acetylcysteine, but caution is advised.
## Contraindications
* Hypersensitivity to acetylcysteine or any component of the formulation.
* Active gastrointestinal bleeding (for oral formulations).
## Adverse Effects
* **Anaphylactoid Reactions:** Flushing, pruritus, rash, urticaria, bronchospasm, dyspnea, angioedema (more common with IV administration).
* **Gastrointestinal:** Nausea, vomiting, diarrhea (especially with oral formulations).
* **Other:** Rash, fever, headache.
## Key Drug Interactions
* **Activated Charcoal:** May reduce the absorption of orally administered acetylcysteine.
* **Nitroglycerin:** May potentiate the vasodilatory effects of nitroglycerin, leading to hypotension and headache.
## Monitoring
* **Acetaminophen Overdose:**
* Liver function tests (AST, ALT, bilirubin, INR) at baseline and regularly thereafter.
* Serum acetaminophen levels.
* Renal function and electrolytes.
* Clinical signs of liver toxicity.
* **Mucolytic Agent:**
* Respiratory status and sputum characteristics.
* Bronchospasm in susceptible individuals.
## Clinical Pearls
* For IV acetaminophen overdose, starting treatment promptly (within 8 hours of ingestion) is critical for efficacy.
* Anaphylactoid reactions to IV acetylcysteine can occur; monitor patients closely, especially during the loading dose. Diphenhydramine may be given prophylactically.
* Nebulized acetylcysteine has an unpleasant odor due to sulfur content.
* Oral acetylcysteine can be associated with significant gastrointestinal upset.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and local protocols for definitive guidance.*
