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# Acetylcysteine
## Overview
Acetylcysteine is a mucolytic agent that breaks down mucus in the respiratory tract. It is also an antidote for acetaminophen overdose.
## Primary Indications
* **Acetaminophen overdose:** To prevent or reduce liver toxicity.
* **Mucolytic:** To thin and loosen respiratory tract secretions in conditions like cystic fibrosis, bronchitis, and pneumonia.
## Adult Dosing
### Acetaminophen Overdose
* **Oral:** Typically 140 mg/kg loading dose, followed by 70 mg/kg every 4 hours for 17 doses.
* **Intravenous (IV):** Protocols vary. A common regimen involves an initial bolus of 150 mg/kg over 60 minutes, followed by 12.5 mg/kg/hour for 4 hours, then 6.25 mg/kg/hour for up to 72 hours. Dosing can be adjusted based on serum acetaminophen levels and hepatic transaminases. Always follow local protocol. Maximum doses are protocol-dependent.
### Mucolytic
* **Inhaled:** 10% solution, 3-5 mL nebulized every 3-4 hours, or 20% solution, 3-5 mL nebulized every 6-8 hours. Frequency and duration depend on patient response and clinical judgment.
## Pediatric Dosing
### Acetaminophen Overdose
* **Oral:** 140 mg/kg loading dose, followed by 70 mg/kg every 4 hours for 17 doses.
* **Intravenous (IV):** Protocols vary. Similar to adults, but weight-based calculations are critical. Always follow local protocol and consider age-specific guidelines.
### Mucolytic
* **Inhaled:** 10% solution, 1-2 mL nebulized every 3-4 hours, or 20% solution, 1-2 mL nebulized every 6-8 hours. Neonates and infants may receive smaller volumes.
## Dose Adjustments
* **Renal Impairment:** No specific adjustments typically recommended for IV acetaminophen overdose protocols. Use with caution.
* **Hepatic Impairment:** No specific adjustments typically recommended for IV acetaminophen overdose protocols. Monitor liver function closely.
## Contraindications
* Hypersensitivity to acetylcysteine or any component of the formulation.
* Active hemorrhage (for inhaled use, though not an absolute contraindication, caution is advised).
## Adverse Effects
* **Inhaled:** Bronchospasm, bronchoconstriction, stomatitis, nausea, vomiting, rhinorrhea.
* **Intravenous:** Anaphylactoid reactions (ranging from rash to anaphylaxis), urticaria, pruritus, angioedema, bronchospasm, dyspnea, hypotension, tachycardia. Nausea and vomiting can occur.
* **Oral:** Nausea, vomiting, diarrhea.
## Key Drug Interactions
* **Activated Charcoal:** Can adsorb oral acetylcysteine, reducing its efficacy. Separate administration by at least 1 hour.
* **Nitroglycerin:** May potentiate hypotensive effects.
## Monitoring
* **Acetaminophen Overdose:**
* Serum acetaminophen levels at appropriate time points (e.g., 4 hours post-ingestion and beyond).
* Liver function tests (AST, ALT, bilirubin, INR) at baseline and periodically (e.g., 24, 48, 72 hours).
* Renal function and electrolytes.
* Clinical signs of hepatotoxicity.
* **Mucolytic Use:**
* Respiratory status (wheezing, shortness of breath).
* Sputum volume and viscosity.
* Bronchospasm.
## Clinical Pearls
* For acetaminophen overdose, early administration of acetylcysteine is crucial for efficacy.
* IV acetylcysteine can cause anaphylactoid reactions. Monitor patients closely and have emergency medications readily available. Premedication with antihistamines may be considered.
* Dilute IV acetylcysteine as per protocol to reduce infusion-related reactions.
* For inhaled acetylcysteine, co-administration with a bronchodilator may be necessary to mitigate bronchospasm.
* The smell of acetylcysteine is unpleasant (sulfurous); this can contribute to nausea and vomiting.
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*This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and institutional protocols before administering any medication.*
