Nac Akut (Acetylcysteine)

Acetylcysteine is used as a mucolytic agent to improve clearance of mucus in various respiratory disorders.

• Chronic bronchitis: reduces mucus viscosity, facilitating expectoration and improving breathing.
• Chronic obstructive pulmonary disease (COPD): helps clear airway secretions, easing airflow limitation.
• Cystic fibrosis: thins thick pulmonary secretions, supporting airway hygiene.
• Acute exacerbations with thickened respiratory secretions: provides rapid mucolysis to relieve congestion.

• Acetylcysteine cleaves disulfide bonds within mucus glycoproteins, breaking the polymeric network that gives mucus its high viscosity. This depolymerisation lowers mucus thickness, allowing ciliary action to transport secretions more effectively. In addition, acetylcysteine serves as a precursor for intracellular glutathione synthesis, contributing antioxidant protection in the respiratory epithelium.

Acetylcysteine may cause a range of adverse reactions, most of which are mild and transient.

Common Side Effects

• Nausea: mild stomach upset occurring after oral intake.
• Vomiting: occasional emesis, generally self‑limiting.
• Diarrhea: loose stools that resolve without intervention.
• Taste disturbance: a sulfur‑like taste in the mouth.

Serious or Rare Side Effects

• Anaphylaxis: severe allergic reaction requiring immediate medical attention.
• Angioedema: swelling of face, lips or throat that may compromise breathing.
• Hepatic dysfunction: abnormal liver enzymes indicating possible liver injury.
• Severe skin reactions: such as Stevens‑Johnson syndrome or toxic epidermal necrolysis.

When using acetylcysteine, several safety considerations should be observed to minimize risk.

• Hypersensitivity: avoid use in patients with known allergy to acetylcysteine or related compounds.
• Asthma: use with caution as inhaled formulations may provoke bronchospasm; monitor respiratory status.
• Liver disease: monitor hepatic function in patients with pre‑existing liver impairment.
• Renal impairment: adjust dosage or monitor closely in severe renal dysfunction.
• Concomitant nitroglycerin: avoid simultaneous use due to risk of enhanced hypotensive effects.
• Store at ambient temperature: keep below 25 °C in the original container, protect from moisture and direct sunlight.

Acetylcysteine can interact with certain medicines, altering their effectiveness or safety profile.

Major Interactions (Avoid)

• Nitroprusside: concurrent use may cause severe hypotension.
• Nitroglycerin: combined administration can potentiate vasodilatory effects leading to dangerous blood pressure drops.

Moderate Interactions (Monitor Closely)

• Activated charcoal: may reduce oral absorption of acetylcysteine if taken within a short interval.
• Antihistamines: can increase anticholinergic load, potentially worsening dry mouth or constipation.
• Certain antibiotics (e.g., carbapenems): may interfere with mucolytic activity; monitor clinical response.