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# Att Drugs (Acetylcysteine)
## Overview
Acetylcysteine is a mucolytic agent that breaks down thick mucus in the airways. It is also used as an antidote for acetaminophen overdose.
## Primary Indications
* **Mucolytic:** Adjunct therapy in patients with chronic bronchopulmonary diseases and acute bronchial, tracheobronchial, and lung infections with abnormal mucus production.
* **Acetaminophen Overdose Antidote:** To prevent or lessen hepatic toxicity following ingestion of an overdose of acetaminophen.
## Adult Dosing
* **Mucolytic:**
* Nebulization: 3-5 mL of a 20% solution (600-1000 mg) or 6-10 mL of a 10% solution (600-1000 mg) every 4-12 hours.
* Direct intratracheal instillation: 1-2 mL of a 20% solution (200-400 mg) every 1-4 hours.
* **Acetaminophen Overdose Antidote:**
* **Oral:** Loading dose of 140 mg/kg, followed by 70 mg/kg every 4 hours for 17 doses (total 71 hours).
* **Intravenous (IV):**
* Initial bolus: 150 mg/kg over 1 hour.
* Second infusion: 50 mg/kg over 4 hours.
* Third infusion: 100 mg/kg over 16 hours.
* *Note: IV protocols may vary; consult local institutional guidelines.*
## Pediatric Dosing
* **Mucolytic:**
* Nebulization: 3-5 mL of 20% solution (600-1000 mg) or 6-10 mL of 10% solution (600-1000 mg) every 4-12 hours.
* Direct intratracheal instillation: 1 mL of a 20% solution (200 mg) every 1-4 hours.
* **Acetaminophen Overdose Antidote:** Dosing is the same as adult dosing (see above).
## Dose Adjustments
No specific dose adjustments are typically required for hepatic or renal impairment, but caution is advised.
## Contraindications
* Hypersensitivity to acetylcysteine or any component of the formulation.
* Active peptic ulcer disease (for oral administration).
## Adverse Effects
* **Common:** Nausea, vomiting, stomatitis, rhinorrhea, drowsiness, urticaria, pruritus.
* **Less Common:** Bronchospasm, dyspnea, rash, fever, anaphylactoid reactions.
* **Serious (IV for overdose):** Anaphylactoid reactions, which can be severe and include bronchospasm, angioedema, and hypotension.
## Key Drug Interactions
* **Activated Charcoal:** May adsorb acetylcysteine, reducing its absorption when used for acetaminophen overdose. Administer charcoal at least 1 hour before or 1 hour after acetylcysteine.
* **Nitroglycerin:** May potentiate the hypotensive effect of nitroglycerin.
## Monitoring
* **Mucolytic Therapy:** Monitor respiratory status, sputum viscosity and volume.
* **Acetaminophen Overdose:** Monitor acetaminophen levels, liver function tests (ALT, AST, bilirubin, INR), and glucose. Monitor for signs of anaphylactoid reaction, especially during IV administration.
## Clinical Pearls
* The odor of acetylcysteine is unpleasant; mixing with flavored beverages may improve palatability for oral administration.
* Nebulized acetylcysteine can cause bronchospasm, particularly in individuals with asthma. Pretreatment with a bronchodilator may be considered.
* IV acetylcysteine for acetaminophen overdose is most effective when initiated within 8-10 hours of ingestion. However, it can still be beneficial even when initiated later, especially if acetaminophen levels are still elevated or liver injury is suspected.
* Anaphylactoid reactions are common with IV acetylcysteine and typically involve the skin and respiratory tract. They are usually manageable with supportive care and do not necessitate discontinuation of therapy if the benefits outweigh the risks.
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*Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and relevant guidelines before making any treatment decisions. Drug information can change, and individual patient factors must be considered.*
