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# Acetylcysteine
## Overview
Acetylcysteine is a mucolytic agent that breaks down thick mucus secretions. It is also an antidote for acetaminophen overdose.
## Primary Indications
* **Acetaminophen Overdose:** Treatment to prevent liver damage.
* **Mucolytic:** To thin mucus in respiratory conditions such as cystic fibrosis, chronic obstructive pulmonary disease (COPD), and pneumonia.
## Adult Dosing
### Acetaminophen Overdose:
* **Loading Dose:** 150 mg/kg intravenously (IV) over 1 hour.
* **Second Dose:** 50 mg/kg IV over 16 hours.
* **Third Dose:** 100 mg/kg IV over 16 hours.
* **Total duration:** 21 hours.
* **Alternative protocol:** For oral administration, 140 mg/kg PO as a loading dose, followed by 70 mg/kg PO every 4 hours for 17 doses.
### Mucolytic:
* **Inhalation:** 1-10 mL of a 10% or 20% solution every 2-6 hours as needed. Dosing may vary based on local protocols and patient response.
* **Oral:** 200-400 mg two to three times daily.
## Pediatric Dosing
### Acetaminophen Overdose:
* **Loading Dose:** 150 mg/kg IV over 1 hour.
* **Second Dose:** 50 mg/kg IV over 16 hours.
* **Third Dose:** 100 mg/kg IV over 16 hours.
* **Total duration:** 21 hours.
* **Alternative protocol (Oral):** Dosing is the same as adults (140 mg/kg PO loading dose, followed by 70 mg/kg PO every 4 hours for 17 doses).
### Mucolytic:
* **Inhalation:** 1-10 mL of a 10% or 20% solution every 2-6 hours as needed. Dosing may vary based on local protocols and patient response. Generally, lower volumes are used for younger children.
* **Oral:** 50-100 mg two to three times daily; may increase to 200 mg two to three times daily.
## Dose Adjustments
No dose adjustment is typically needed for renal or hepatic impairment, but caution is advised in severe cases of hepatic impairment with acetaminophen overdose.
## Contraindications
* Hypersensitivity to acetylcysteine or any component of the formulation.
* Active hemorrhage (oral administration).
## Adverse Effects
* **Common:** Nausea, vomiting, stomatitis, rash, pruritus, bronchospasm (especially with inhalation).
* **Serious:** Anaphylactoid reactions, angioedema, Stevens-Johnson syndrome, toxic epidermal necrolysis.
## Key Drug Interactions
* **Activated Charcoal:** May bind to oral acetylcysteine, reducing absorption. If used concurrently, separate administration by at least 1 hour.
* **Nitroglycerin:** May potentiate hypotensive effects.
## Monitoring
* **Acetaminophen Overdose:**
* Liver function tests (ALT, AST, bilirubin, INR) at baseline, 24 hours, and then as clinically indicated.
* Acetaminophen levels.
* Clinical signs of liver toxicity.
* **Mucolytic:**
* Respiratory status, oxygen saturation.
* Airway patency.
* Signs of bronchospasm.
## Clinical Pearls
* For IV administration in acetaminophen overdose, the risk of anaphylactoid reaction is highest during the initial loading dose.
* Always dilute inhaled acetylcysteine to at least a 10% solution with sterile water for inhalation.
* Oral acetylcysteine has an unpleasant sulfurous odor, which may lead to poor compliance. Antiemetics may be helpful.
* Inhalation can sometimes worsen bronchospasm; co-administration of a bronchodilator may be necessary.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols for definitive guidance.*
