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# Acetylcysteine
## Overview
Acetylcysteine is a mucolytic agent that works by breaking down disulfide bonds in mucus, decreasing its viscosity. It is also an antidote for acetaminophen overdose.
## Primary Indications
* **Acetaminophen Overdose:** Treatment to prevent or reduce liver toxicity.
* **Mucolytic:** Adjunct therapy for respiratory conditions associated with excessive or thick mucus (e.g., bronchitis, cystic fibrosis, COPD).
## Adult Dosing
**Acetaminophen Overdose:**
* **IV:** Load: 150 mg/kg IV over 60 minutes. Followed by: 12.5 mg/kg/hour IV for 4 hours, then 6.25 mg/kg/hour IV for 16 hours.
* Total duration: 21 hours.
* Maximum dose: Generally not specified, but consider renal and hepatic function.
* **PO:** Load: 140 mg/kg PO. Followed by: 70 mg/kg PO every 4 hours for 17 doses.
* Total duration: 72 hours.
* Maximum dose: 140 mg/kg per dose, 70 mg/kg every 4 hours.
**Mucolytic:**
* **PO:** 200 mg to 400 mg twice or three times daily.
* **Nebulized:** 1-10 mL of 10% or 20% solution every 2-6 hours as needed.
* Maximum nebulized dose: 20% solution, 10 mL per treatment, frequency varies.
## Pediatric Dosing
**Acetaminophen Overdose (IV):**
* **Load:** 150 mg/kg IV over 60 minutes.
* **Followed by:** 12.5 mg/kg/hour IV for 4 hours, then 6.25 mg/kg/hour IV for 16 hours.
* Total duration: 21 hours.
* Use weight-based dosing up to adult maximums if applicable, though dedicated pediatric protocols may differ.
**Acetaminophen Overdose (PO):**
* **Load:** 140 mg/kg PO.
* **Followed by:** 70 mg/kg PO every 4 hours for 17 doses.
* Total duration: 72 hours.
* Maximum dose: 140 mg/kg per dose, 70 mg/kg every 4 hours.
**Mucolytic:**
* **PO:** 50 mg/kg to 200 mg twice daily, up to 400 mg/day.
* **Nebulized:** 1-10 mL of 10% or 20% solution every 2-6 hours as needed.
* For infants and young children, may use 10% solution.
## Dose Adjustments
* **Renal Impairment:** Use with caution. No specific dose adjustments are established, but monitor closely for adverse effects.
* **Hepatic Impairment:** Use with caution, especially in the context of acetaminophen overdose where hepatic function is compromised. Monitor closely.
## Contraindications
* Hypersensitivity to acetylcysteine or any component of the formulation.
## Adverse Effects
* **Common:** Nausea, vomiting, stomatitis, rash, pruritus, rhinorrhea.
* **Serious:** Bronchospasm (especially with nebulized), anaphylactoid reactions, angioedema.
* **Rare:** Hemorrhagic complications (associated with IV administration).
## Key Drug Interactions
* **Activated Charcoal:** May adsorb oral acetylcysteine, reducing its absorption. Administer oral acetylcysteine at least 1 hour after activated charcoal if used for acetaminophen overdose.
* **Nitroglycerin:** May potentiate hypotensive effects.
## Monitoring
* **Acetaminophen Overdose:**
* Liver function tests (AST, ALT, bilirubin, INR) at baseline and every 24 hours during treatment.
* Acetaminophen levels.
* Renal function.
* **Mucolytic:**
* Respiratory status.
* Secretions.
## Clinical Pearls
* For IV administration in acetaminophen overdose, ensure adequate hydration and monitor for anaphylactoid reactions, especially during the initial loading dose.
* Oral acetylcysteine can have an unpleasant odor and taste; this may be mitigated by using flavored solutions or administering it with a carbonated beverage.
* Nebulized acetylcysteine can sometimes cause bronchospasm; consider co-administration of a bronchodilator.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the current prescribing information and relevant guidelines for complete and up-to-date details before making any clinical decisions. Dosing may vary based on institutional protocols and individual patient factors.
