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# Acetylcysteine
## Overview
Acetylcysteine is a mucolytic agent that breaks disulfide bonds in mucoproteins, reducing mucus viscosity. It is also an antidote for acetaminophen overdose by replenishing hepatic glutathione stores.
## Primary Indications
* **Acetaminophen overdose:** As an antidote to prevent or reduce liver damage.
* **Mucolytic agent:** To reduce the viscosity of excessive or thickened bronchial secretions in patients with chronic obstructive pulmonary disease (COPD), cystic fibrosis, or bronchitis.
## Adult Dosing
* **Acetaminophen overdose:**
* **Oral:** Loading dose of 140 mg/kg, followed by 70 mg/kg every 4 hours for 17 doses.
* **Intravenous (IV):** Typically administered as a 3-bag or 4-bag protocol. A common protocol includes an initial bolus of 150 mg/kg over 1 hour, followed by 12.5 mg/kg/hour for 4 hours, and then 6.25 mg/kg/hour for the remaining 16 hours. Protocols may vary; consult local guidelines. Maximum doses depend on the protocol used.
* **Mucolytic:**
* **Inhaled:** 1-10 mL of a 10% or 20% solution every 2-6 hours, or 3-5 mL of a 20% solution BID. Higher concentrations may be used for more viscous secretions.
* **Oral:** 200 mg twice daily to 600 mg three times daily.
## Pediatric Dosing
* **Acetaminophen overdose:**
* **Oral:** Loading dose of 140 mg/kg, followed by 70 mg/kg every 4 hours for 17 doses.
* **Intravenous (IV):** Similar protocols to adults are used, adjusted for weight. Consult specific pediatric IV protocols and local guidelines.
* **Mucolytic:**
* **Inhaled:** 1-5 mL of a 10% or 20% solution every 2-6 hours. Specific recommendations may vary by age and condition.
## Dose Adjustments
No specific dose adjustments are typically required for hepatic or renal impairment, but caution is advised, especially in patients with severe hepatic disease.
## Contraindications
* Hypersensitivity to acetylcysteine or any component of the formulation.
* Active peptic ulcer disease (oral form may exacerbate).
## Adverse Effects
* **Inhaled:** Bronchospasm, bronchoconstriction, rhinorrhea, nausea, vomiting, stomatitis.
* **Oral:** Nausea, vomiting, diarrhea, rash, fever.
* **IV:** Anaphylactoid reactions (most serious), rash, urticaria, pruritus, tachycardia, hypotension, bronchospasm.
## Key Drug Interactions
* **Activated charcoal:** May adsorb oral acetylcysteine, reducing its efficacy in acetaminophen overdose. Separate administration by at least 2 hours.
* **Nitroglycerin:** May potentiate the vasodilatory effects of nitroglycerin, leading to hypotension.
## Monitoring
* **Acetaminophen overdose:**
* Serum acetaminophen levels (serial monitoring).
* Liver function tests (LFTs).
* Prothrombin time (PT)/International Normalized Ratio (INR).
* Blood glucose.
* Electrolytes.
* Renal function.
* **Mucolytic:**
* Respiratory status (breath sounds, oxygen saturation).
* Incidence of bronchospasm.
## Clinical Pearls
* For inhaled acetylcysteine, co-administration with a bronchodilator may be necessary to prevent bronchospasm.
* The smell of acetylcysteine can be unpleasant.
* IV acetylcysteine can cause anaphylactoid reactions. Monitor patients closely, especially during the initial infusion. Have emergency resuscitation equipment readily available.
* The efficacy of acetylcysteine in acetaminophen overdose is time-dependent; early administration is crucial.
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*This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and institutional protocols for complete details before initiating or modifying therapy.*
