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# Acetylcysteine
## Overview
Acetylcysteine is a mucolytic agent that works by breaking down disulfide bonds in mucoproteins, reducing the viscosity of mucus. It is also an antidote for acetaminophen overdose.
## Primary Indications
* **Acetaminophen Overdose:** Treatment to prevent hepatotoxicity.
* **Mucolytic:** To thin respiratory secretions in conditions such as bronchitis, emphysema, and cystic fibrosis.
## Adult Dosing
**Acetaminophen Overdose:**
* **Loading Dose:** 150 mg/kg IV infused over 1 hour.
* **Second Infusion:** 50 mg/kg IV infused over 16 hours.
* **Subsequent Infusions:** For patients with high acetaminophen levels or delayed presentation, additional infusions may be needed. Specific protocols vary.
**Mucolytic:**
* **Nebulization:** 1-10 mL of a 10% or 20% solution every 2-6 hours as needed.
* **Oral:** 200 mg (usually 2 sachets of 100 mg or 1 sachet of 200 mg) 2-3 times daily.
## Pediatric Dosing
**Acetaminophen Overdose:**
* **Loading Dose:** 150 mg/kg IV infused over 1 hour.
* **Second Infusion:** 50 mg/kg IV infused over 16 hours.
* Dosage is weight-based.
**Mucolytic:**
* **Nebulization:** 1-10 mL of a 10% or 20% solution every 2-6 hours as needed.
* **Oral:** 50-100 mg 2-3 times daily. May be increased to 200 mg 2-3 times daily. Specific dosing often follows local protocol or is based on age and weight.
## Dose Adjustments
No dose adjustments are typically needed for renal or hepatic impairment for the mucolytic indication. For acetaminophen overdose, dose adjustments are generally not required based on these parameters but are guided by acetaminophen serum levels and clinical response.
## Contraindications
* Hypersensitivity to acetylcysteine.
* Active hemorrhage (for nebulized formulations).
## Adverse Effects
* **IV (Acetaminophen Overdose):** Anaphylactoid reactions (rash, urticaria, bronchospasm, angioedema, hypotension), nausea, vomiting.
* **Nebulized:** Bronchospasm, nausea, vomiting, stomatitis.
* **Oral:** Nausea, vomiting, diarrhea, rash.
## Key Drug Interactions
* **Activated Charcoal:** May bind to oral acetylcysteine, reducing its absorption. Separate administration by at least 1 hour.
* **Nitroglycerin:** Potential for additive hypotension. Monitor blood pressure.
## Monitoring
* **Acetaminophen Overdose:**
* Acetaminophen serum levels.
* Liver function tests (ALT, AST, bilirubin, INR).
* Prothrombin time.
* Renal function.
* Clinical signs of hepatotoxicity.
* **Mucolytic:**
* Respiratory status and sputum production.
* Bronchospasm.
## Clinical Pearls
* For IV administration in acetaminophen overdose, using a more dilute solution (e.g., 15 mg/mL) may reduce infusion-related reactions.
* The smell of acetylcysteine can be unpleasant; masking with juice or flavoring may improve patient adherence for oral or nebulized routes.
* Nebulized acetylcysteine can cause bronchospasm; consider co-administration with a bronchodilator.
* For IV acetaminophen overdose, continuing treatment beyond 24 hours is generally not recommended unless liver or kidney abnormalities persist.
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*Please verify current prescribing information and institutional protocols for definitive dosing and management.*
