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# Acetylcysteine
## Overview
Acetylcysteine is a mucolytic agent that breaks disulfide bonds in mucus, reducing its viscosity. It is also an antidote for acetaminophen overdose.
## Primary Indications
* **Acetaminophen Overdose:** To prevent or reduce liver damage.
* **Mucolytic:** To thin thick mucus secretions in conditions such as bronchitis, cystic fibrosis, and COPD.
## Adult Dosing
* **Acetaminophen Overdose:**
* **Oral:** A loading dose of 140 mg/kg, followed by 70 mg/kg every 4 hours for 17 doses. Maximum single dose 70 mg/kg.
* **Intravenous (IV):** Typically a 3-bag protocol:
* Bag 1: 150 mg/kg in 200 mL over 60 minutes.
* Bag 2: 50 mg/kg in 450 mL over 16 hours.
* Bag 3: 50 mg/kg in 450 mL over 16 hours.
* *Note: Specific IV protocols and concentrations may vary; consult local protocols.*
* **Mucolytic:**
* **Inhaled:** 10% solution: 3-5 mL every 6-12 hours. 20% solution: 1-2 mL every 6-12 hours.
* **Nebulized:** Dosing can vary; often 3-10 mL of a 10% solution or 1-5 mL of a 20% solution as needed.
* **Oral:** Typically 200 mg twice daily to three times daily.
## Pediatric Dosing
* **Acetaminophen Overdose:**
* **Oral:** Same as adult: 140 mg/kg loading dose, then 70 mg/kg every 4 hours for 17 doses.
* **Intravenous (IV):** Same as adult: 3-bag protocol is generally used.
* **Mucolytic:**
* **Inhaled:**
* Neonates: 1-2 mL of 10% solution every 2-6 hours.
* Infants and Children: 10% solution: 3-5 mL every 6-12 hours. 20% solution: 1-2 mL every 6-12 hours.
* **Nebulized:** Dosing varies; typically 1-2 mL of 10% solution or 1 mL of 20% solution every 2-6 hours for neonates, and higher for older children.
* **Oral:** Typically 10 mg/kg twice daily to three times daily, up to adult doses.
## Dose Adjustments
No dose adjustment is generally required for renal or hepatic impairment in acetaminophen overdose, though cautious use may be warranted in severe hepatic dysfunction. For mucolytic use, adjustments are based on patient response and tolerance.
## Contraindications
* Hypersensitivity to acetylcysteine.
* Active gastrointestinal bleeding (for oral administration).
## Adverse Effects
* **Inhaled:** Bronchospasm, bronchoconstriction, rhinorrhea, nausea, vomiting.
* **IV:** Anaphylactoid reactions (rash, pruritus, urticaria, angioedema, bronchospasm, tachycardia, hypotension), fever, nausea, vomiting.
* **Oral:** Nausea, vomiting, diarrhea, stomatitis, rash.
## Key Drug Interactions
* **Activated Charcoal:** Can adsorb acetylcysteine, reducing its efficacy in acetaminophen overdose. Separate administration by at least 1 hour.
* **Nitroglycerin:** Potential for additive hypotension.
## Monitoring
* **Acetaminophen Overdose:** Serum acetaminophen levels, liver function tests (AST, ALT, bilirubin, INR), glucose, BUN, creatinine.
* **Mucolytic:** Respiratory status, sputum production, signs of bronchospasm.
## Clinical Pearls
* For IV administration in acetaminophen overdose, rapid infusion or high concentrations can increase the risk of anaphylactoid reactions.
* Bronchodilators may be administered prior to inhaled acetylcysteine to reduce the risk of bronchospasm.
* The characteristic sulfurous odor is normal.
* The efficacy of oral acetylcysteine for acetaminophen overdose is generally considered less reliable than IV or inhaled routes, especially in severe overdoses.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant guidelines before administering any medication.*
