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Carbocisteine

AEMPS

Mucolytic agent

ATC code: R05CB03

Updated · Methodology

Indications

C

Productive cough

Adjunct

Used in cough with hard-to-clear sputum in acute bronchitis, chronic obstructive lung disease, and bronchiectasis. Adult dose 750 mg three times daily. In COPD, long-term use (over 6 months) modestly reduces exacerbation frequency per the Cochrane 2019 meta-analysis (RR 0.75, 95% CI 0.68–0.84). In acute bronchitis in otherwise healthy adults, effect is modest – not a preferred choice in international guidelines.

Sources

  1. AEMPS: Ficha técnica de Carbocisteína (2024)
  2. Cochrane: Over-the-counter (OTC) medications to reduce cough as an adjunct to antibiotics for acute pneumonia (2014)

ICD-10: R05 · ICD-11: MD12

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

F

Immune support and respiratory infection care

Not recommended

Carbocisteine is a mucolytic. It is prescribed for chronic respiratory diseases with thick sputum. For acute viral infections in children, carbocisteine is prescribed at the first signs of a cold and to enhance the immune response. The Cochrane review by Chalumeau 2013 and the PRAC restricted carbocisteine use in children under 2 due to risk of paradoxical worsening of breathing. The drug carries specific risks: allergic reactions and GI disturbances. If carbocisteine was prescribed to a child for an ordinary cold, consider seeking a second opinion.

Sources

  1. AEMPS: Ficha técnica de Carbocisteína (2024)
  2. Cochrane (Hemila and Chalker): Vitamin C for preventing and treating the common cold (2013)
How to read tiers A–F
  • AStrong evidence – first or second line in international guidelines
  • BRecommended in selected cases
  • CStudy data contradict each other
  • DBenefit not proven, no documented harm
  • FDocumented harm, or risk without benefit

Mechanism of action

An L-cysteine amino acid derivative. Activates sialyltransferase in bronchial goblet cells and normalizes the ratio of acidic to neutral sialomucins in secretions, reducing sputum viscosity. Unlike acetylcysteine, it does not break mucopolysaccharide disulfide bonds. Half-life 2 hours, dosed 2–3 times daily. Widely used in Spain under the Pectox brand.

Safety

Contraindications

  • Carbocisteine hypersensitivity
  • Active peptic ulcer
  • Age under 2
  • Severe hepatic or renal impairment
  • T1 of pregnancy

Serious adverse effects

  • Severe cutaneous reactions (Stevens–Johnson syndrome – rare cases)
  • GI bleeding in predisposed patients
  • Anaphylaxis

Common adverse effects

  • Nausea, vomiting
  • Diarrhea
  • Epigastric pain
  • Headache
  • Skin rash

Pregnancy: can you take Carbocisteine?

Contraindicated in T1. T2 and T3 use is acceptable when indicated.

Breastfeeding: can you take Carbocisteine?

Limited data. Use with caution during lactation.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

Practical notes

Timing and administration

Take with or without food, swallowed with water. Course in acute bronchitis 5–7 days; in chronic bronchitis and COPD, long-term (6 months or more). In patients with prior peptic ulcer, use with caution – GI mucosal irritation possible. Do not combine with cough suppressants (dextromethorphan, codeine) – suppressing cough while stimulating secretion is hazardous.

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Frequently asked

What is Carbocisteine used for?

Carbocisteine is evaluated for the following indications with varying evidence strength: Productive cough (evidence tier C), Immune support and respiratory infection care (evidence tier F). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Carbocisteine?

Common side effects of Carbocisteine (≥ 1 in 100): Nausea, vomiting, Diarrhea, Epigastric pain, Headache, Skin rash. See the Safety section for uncommon and serious reactions.

Is Carbocisteine safe during pregnancy?

Contraindicated in T1. T2 and T3 use is acceptable when indicated.

Is Carbocisteine compatible with breastfeeding?

Limited data. Use with caution during lactation.

Who should not take Carbocisteine?

Carbocisteine is contraindicated in: Carbocisteine hypersensitivity; Active peptic ulcer; Age under 2; Severe hepatic or renal impairment; T1 of pregnancy. Full list in the Safety section.

Official sources

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Other drugs in this group

Acetylcysteine, Ambroxol, Bromhexine, Cloperastine, Dextromethorphan, Guaifenesin, Ivy leaf dry extract (Hedera helix), Paracetamol + Chlorpheniramine + Phenylephrine