Kofimucil Mucolitico (Acetylcysteine)

Acetylcysteine is used as a mucolytic to improve mucus clearance in several respiratory disease categories.

• Chronic bronchitis: reduces mucus thickness, aiding expectoration and relieving cough.
• Chronic obstructive pulmonary disease (COPD): thins airway secretions to improve airflow and reduce exacerbations.
• Sinusitis: lowers sinus mucus viscosity, facilitating drainage and symptom relief.
• Acute respiratory infections: helps clear excessive mucus, supporting recovery.

• Acetylcysteine exerts its mucolytic effect by cleaving the disulfide bonds that link mucin glycoprotein subunits. This chemical reduction disrupts the three‑dimensional network of mucus, decreasing its viscoelasticity. The resulting thinner secretions are more easily moved by ciliary action and coughing, enhancing clearance from the respiratory tract. Additionally, the free sulfhydryl groups may contribute to antioxidant activity, though the primary therapeutic action in the respiratory system is mucus depolymerisation.

Acetylcysteine may cause a range of adverse reactions, varying from mild to severe.

Common Side Effects

• Nausea: mild stomach upset often occurring after oral intake.
• Diarrhea: loose stools that may be transient.
• Skin rash: mild erythema or itching.
• Unpleasant odor: a characteristic sulfur‑like taste or breath.

Serious or Rare Side Effects

• Anaphylaxis: severe allergic reaction with difficulty breathing and swelling.
• Bronchospasm: sudden narrowing of airways, especially in asthmatic patients.
• Hepatic dysfunction: elevated liver enzymes or jaundice.
• Angioedema: rapid swelling of face, lips or tongue.

When prescribing acetylcysteine, clinicians should consider several precautionary measures to ensure safe use.

• Renal function: assess kidney status, dose may need adjustment in impairment.
• Asthma or bronchospasm: monitor closely, avoid if active bronchospasm present.
• Hypersensitivity: discontinue if allergic reaction occurs.
• Concomitant nitroglycerin: avoid co‑administration due to risk of hypotension.
• Pregnancy and lactation: use only if benefit outweighs risk.
• Store at room temperature: keep in original packaging, protect from moisture.

Acetylcysteine can interact with other medicines, affecting their efficacy or safety.

Major Interactions (Avoid)

• Nitroglycerin: may cause profound hypotension when combined.
• Activated charcoal: reduces acetylcysteine absorption if given concurrently.

Moderate Interactions (Monitor Closely)

• Anticoagulants (e.g., warfarin): may increase bleeding tendency.
• Antipsychotics (e.g., clozapine): potential for enhanced bronchospasm.
• Oral contraceptives: possible reduction in hormonal effectiveness.