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# Acetylcysteine
## Overview
Acetylcysteine is a mucolytic agent that reduces the viscosity of respiratory secretions. It is also the antidote for acetaminophen overdose.
## Primary Indications
* **Acetaminophen Overdose:** To prevent or reduce liver damage.
* **Mucolytic Agent:** To thin mucus in conditions such as cystic fibrosis, chronic bronchitis, and pneumonia.
## Adult Dosing
### Acetaminophen Overdose
The standard protocol involves an initial loading dose, followed by subsequent doses. A common regimen is:
* **Loading dose:** 150 mg/kg IV over 60 minutes.
* **Second dose:** 50 mg/kg IV over the next 4 hours.
* **Third dose:** 100 mg/kg IV over the next 16 hours.
**Note:** The total dose should not exceed 150 mg/kg over the first 8 hours. Dosing may vary based on serum acetaminophen levels and time since ingestion. Always consult local protocols or the Poison Control Center.
### Mucolytic Agent
* **Inhalation:** 1-10 mL of a 10-20% solution or 2-20 mL of a 5% solution via nebulizer every 2-6 hours.
* **Oral:** 200 mg twice daily to 1000 mg three times daily.
## Pediatric Dosing
### Acetaminophen Overdose
Pediatric dosing follows the same principles as adult dosing (150 mg/kg IV loading dose, then 50 mg/kg IV over 4 hours, then 100 mg/kg IV over 16 hours). Maximum doses are capped based on body weight.
### Mucolytic Agent
* **Inhalation:**
* Neonates and infants: 1-2 mL of a 10-20% solution or 2-4 mL of a 5% solution via nebulizer every 2-6 hours.
* Children: 1-10 mL of a 10-20% solution or 2-20 mL of a 5% solution via nebulizer every 2-6 hours.
* **Oral:** Dosing varies by age and indication. Typically 5-10 mg/kg up to twice daily or three times daily.
## Dose Adjustments
No specific dose adjustments are routinely recommended for renal or hepatic impairment for the acetaminophen overdose protocol. For mucolytic use, adjust based on patient response and tolerance.
## Contraindications
* Hypersensitivity to acetylcysteine or any component of the formulation.
* Active exacerbation of bronchospasm (for inhaled formulations).
## Adverse Effects
### Intravenous Acetylcysteine
* Anaphylactoid reactions (ranging from rash and pruritus to bronchospasm and hypotension).
* Nausea, vomiting.
* Flushing.
* Angioedema.
### Inhaled Acetylcysteine
* Bronchospasm, particularly in patients with asthma.
* Stomatitis.
* Nausea, vomiting.
* Rhinorrhea.
### Oral Acetylcysteine
* Nausea, vomiting.
* Diarrhea.
* Rash.
## Key Drug Interactions
* **Activated Charcoal:** May adsorb acetylcysteine, reducing its absorption. Separate administration by at least 1 hour.
* **Nitroglycerin:** May potentiate hypotensive effects. Monitor blood pressure.
## Monitoring
* **Acetaminophen Overdose:** Monitor serum acetaminophen levels, liver function tests (ALT, AST, bilirubin), coagulation studies (PT/INR), renal function, and glucose. Closely observe for signs of anaphylactoid reactions during IV infusion.
* **Mucolytic Agent:** Monitor for respiratory status, sputum viscosity, and signs of bronchospasm.
## Clinical Pearls
* Intravenous acetylcysteine is most effective when initiated within 8 hours of acetaminophen ingestion.
* Always have resuscitation equipment readily available when administering intravenous acetylcysteine due to the risk of anaphylactoid reactions.
* For inhaled acetylcysteine, pre-treatment with a bronchodilator may be necessary in patients prone to bronchospasm.
* The smell of acetylcysteine is characteristically sulfurous (rotten eggs) and can be unpleasant.
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**Disclaimer:** This information is intended for healthcare professionals and does not replace comprehensive drug information resources or clinical judgment. Always consult the most current prescribing information and institutional protocols before administering any medication.
