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# Acetylcysteine
## Overview
Acetylcysteine is a mucolytic agent that disrupts disulfide bonds in mucus, decreasing its viscosity. It is also an antidote for acetaminophen overdose by replenishing hepatic glutathione stores.
## Primary Indications
* **Acetaminophen overdose:** Treatment to prevent or reduce liver damage.
* **Mucolytic:** To thin respiratory secretions in patients with conditions like COPD, cystic fibrosis, or pneumonia.
## Adult Dosing
**Acetaminophen Overdose:**
* **IV:** A standard protocol typically involves an initial loading dose of 150 mg/kg IV over 60 minutes, followed by an infusion of 12.5 mg/kg/hr for 4 hours, and then 6.25 mg/kg/hr for 16 hours. Total duration is 20-21 hours. Protocols may vary; consult local guidelines.
* **PO:** Typically 140 mg/kg orally as a loading dose, followed by 70 mg/kg orally every 4 hours for 17 doses. Nausea and vomiting are common.
**Mucolytic (Nebulized):**
* 3-10 mL of a 20% solution or 6-10 mL of a 10% solution every 2-6 hours as needed.
## Pediatric Dosing
**Acetaminophen Overdose:**
* Dosing is based on weight and is identical to adult IV and PO dosing. Ensure accurate weight-based calculations.
**Mucolytic (Nebulized):**
* **Infants and children up to 1 year:** 1-2 mL of a 20% solution or 2-4 mL of a 10% solution every 2-6 hours.
* **Children 1-12 years:** 3-5 mL of a 20% solution or 6-10 mL of a 10% solution every 2-6 hours.
## Dose Adjustments
* No specific dose adjustments are typically required for renal or hepatic impairment, though caution is advised in severe cases.
## Contraindications
* Known hypersensitivity to acetylcysteine.
* Certain patients with asthma may require caution due to potential for bronchospasm.
## Adverse Effects
* **IV (Acetaminophen Overdose):** Anaphylactoid reactions (rash, pruritus, urticaria, angioedema, bronchospasm, dyspnea), hypotension, tachycardia. Rarely, Stevens-Johnson syndrome, toxic epidermal necrolysis.
* **PO (Acetaminophen Overdose):** Nausea, vomiting, stomatitis, diarrhea.
* **Nebulized:** Bronchospasm, rhinorrhea, nausea, vomiting, stomatitis.
## Key Drug Interactions
* **Activated Charcoal:** May adsorb oral acetylcysteine, reducing its absorption. Separate administration by at least 2 hours.
* **Nitroglycerin:** Potentiates hypotensive effects.
## Monitoring
* **Acetaminophen Overdose:** Serum acetaminophen levels, liver function tests (AST, ALT, bilirubin, INR), glucose, electrolytes, renal function, and clinical status. Monitor for anaphylactoid reactions.
* **Mucolytic:** Respiratory status, effectiveness in clearing secretions, presence of bronchospasm.
## Clinical Pearls
* For IV administration in acetaminophen overdose, rapid infusion or bolus can increase the risk of anaphylactoid reactions. Slow infusion is preferred.
* Oral acetylcysteine should be diluted and administered with a straw to minimize gastrointestinal upset. Antiemetics may be helpful.
* Bronchospasm is a significant risk with nebulized acetylcysteine, especially in patients with reactive airway disease. Bronchodilators should be readily available and may be co-administered.
* The smell of acetylcysteine is distinct and can be unpleasant; this does not typically indicate loss of efficacy.
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*Disclaimer: This information is intended for clinical use and is not a substitute for professional medical advice. Always consult the most current prescribing information and institutional protocols before making any treatment decisions.*
