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# Acetylcysteine
## Overview
Acetylcysteine is a mucolytic agent that works by decreasing the viscosity of respiratory secretions. It is also the antidote for acetaminophen overdose.
## Primary Indications
* **Acetaminophen Overdose:** Treatment to prevent or reduce liver damage.
* **Mucolytic:** To thin and loosen mucus in patients with chronic tracheostomy or certain respiratory conditions (e.g., COPD, cystic fibrosis).
## Adult Dosing
**Acetaminophen Overdose:**
* **Loading Dose:** 150 mg/kg IV infused over 1 hour.
* **Second Dose:** 50 mg/kg IV infused over 2 hours.
* **Third Dose:** 100 mg/kg IV infused over 3 hours.
* Total treatment duration is typically 21 hours. Dosing may be adjusted based on acetaminophen levels and time since ingestion. Local protocols are essential.
**Mucolytic:**
* **Inhaled:** 1 to 10 mL of a 10% or 20% solution, or 3 to 5 mL of a 20% solution, via nebulizer every 2 to 6 hours as needed.
## Pediatric Dosing
**Acetaminophen Overdose:**
* Dosing is the same as adult: 150 mg/kg IV over 1 hour, then 50 mg/kg IV over 2 hours, then 100 mg/kg IV over 3 hours. Total treatment duration is typically 21 hours. Local protocols are essential.
**Mucolytic:**
* **Inhaled:** 1 to 10 mL of a 10% or 20% solution, or 3 to 5 mL of a 20% solution, via nebulizer every 2 to 6 hours as needed.
## Dose Adjustments
No specific dose adjustments are typically required for renal or hepatic impairment for the mucolytic indication. For acetaminophen overdose, dosing is based on weight and acetaminophen levels.
## Contraindications
* Hypersensitivity to acetylcysteine.
## Adverse Effects
* **Inhaled:** Bronchospasm, bronchoconstriction, airway irritation, stomatitis, rhinorrhea, nausea, vomiting.
* **IV (Acetaminophen Overdose):** Anaphylactoid reactions (rash, pruritus, bronchospasm, angioedema, dyspnea), nausea, vomiting, flushing, tachycardia, hypotension. Severe reactions are rare but can be life-threatening.
## Key Drug Interactions
* **Activated Charcoal:** May adsorb acetylcysteine, reducing its efficacy in acetaminophen overdose. Administer these agents at least 1 hour apart.
## Monitoring
* **Acetaminophen Overdose:** Monitor acetaminophen levels, liver function tests (ALT, AST, bilirubin, PT/INR), glucose, and renal function. Observe for signs of anaphylaxis.
* **Mucolytic:** Monitor respiratory status, lung sounds, and signs of bronchospasm.
## Clinical Pearls
* For inhaled acetylcysteine, pre-treatment with a bronchodilator may be necessary to prevent bronchospasm.
* In acetaminophen overdose, early administration of acetylcysteine is crucial for efficacy.
* IV acetylcysteine infusions for overdose can cause anaphylactoid reactions; monitor patients closely and be prepared to manage these reactions.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and local protocols for definitive guidance.*
