Nakys (Acetylcysteine)

Acetylcysteine is used to manage mucus‑related respiratory conditions and as an antidote in specific toxic exposures.

• Chronic bronchitis: reduces mucus viscosity and improves airway clearance.
• Chronic obstructive pulmonary disease (COPD): aids sputum expectoration and eases breathing.
• Other respiratory disorders with thick secretions: facilitates mucolysis and symptom relief.
• Acetaminophen (paracetamol) overdose: provides glutathione precursor to protect the liver.

• Acetylcysteine cleaves disulfide bonds within mucus glycoproteins, lowering mucus viscosity and promoting clearance from the airways. It also serves as a cysteine donor for glutathione synthesis, enhancing hepatic detoxification pathways that neutralize reactive metabolites of acetaminophen.

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

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Vomiting: occasional emesis after dosing.
• Diarrhea: loose stools in some patients.
• Abdominal discomfort: cramping or pain.
• Rash: skin redness or itching.
• Headache: transient head pain.

Serious or Rare Side Effects

• Anaphylaxis: severe allergic reaction requiring immediate medical attention.
• Stevens‑Johnson syndrome: rare severe skin eruption.
• Bronchospasm: tightening of airway muscles, especially in asthmatic patients.
• Hepatic dysfunction: abnormal liver enzymes.
• Neutropenia: reduced white blood cell count.
• Angioedema: swelling of face, lips, or throat.

When prescribing acetylcysteine, clinicians should consider several safety measures.

• Renal function assessment: adjust use in patients with severe kidney impairment.
• Allergy monitoring: watch for signs of hypersensitivity or anaphylaxis.
• Asthma caution: avoid in uncontrolled asthma due to potential bronchospasm.
• Nitroglycerin co‑administration: avoid because of additive hypotensive effects.
• Drug review: evaluate all concurrent medications for possible interactions.
• Store at room temperature: keep in the original packaging, protect from moisture and direct sunlight.

Acetylcysteine can affect the activity of several other medicines.

Major Interactions (Avoid)

• Nitroglycerin: combined use may cause profound hypotension.
• Activated charcoal: reduces acetylcysteine absorption when given concurrently.
• Certain anticoagulants: may increase bleeding risk when used together.

Moderate Interactions (Monitor Closely)

• Anticholinergic agents: may blunt mucolytic effectiveness.
• ACE inhibitors: monitor blood pressure for additive effects.
• Loop diuretics: watch for electrolyte disturbances.