Ingredient

Acetylcysteine

Acetylcysteine is an expectorant ingredient that thins mucus and relieves coughing.

See medicines used for Cold / Congestion / CoughSee medicines used for Respiratory & Infection
All medicines
140
Single ingredient
103
Combination
37
Prescription medication
33
OTC medication
107

MFDS ingredient code M050972

What does it do?

Acetylcysteine is a medication used for mucus dissolution and cough relief. It primarily helps in expelling sticky mucus in respiratory diseases. Additionally, it is utilized for treating liver damage through its detoxifying effects.

Acetylcysteine breaks the protein bonds in mucus, making it less viscous. This allows mucus to be easily expelled during coughing, facilitating easier breathing. It also exhibits antioxidant properties within the body, helping to reduce cell damage.

Commonly used for

Approved uses differ by product. Check each product's information for its actual use.

Good to know

Unlike simple expectorants, acetylcysteine alters the chemical structure of mucus to exert its effects. Its detoxifying action, which also contributes to liver protection, distinguishes it from other expectorant medications.

Medicines containing this ingredient

Even with the same ingredient, strength, dosage form and how it is taken can differ.

Category
Dosage form
Strength
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140 total

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Even with the same ingredient, dosage and approved uses can differ by strength, dosage form and combined ingredients. Check each product's information before taking it.

Combined ingredients

Ingredients used together with this ingredient in combination products.

Questions about this ingredient

  • QIs it okay to give my child this medication if they have a lot of phlegm?

    Whether a product containing acetylcysteine can be used for children and how to use it varies by product. Please check the age guidelines in the product information before administering it, and if your child's cough persists, seek consultation with a pediatrician.

    Answers 1 · 2026.09.14

  • QWhat if both an expectorant and a general cold medicine contain acetylcysteine?

    Acetylcysteine can be used in various products related to cough and mucus, so taking them together may result in ingredient overlap. Please compare the ingredient lists and confirm with your pharmacist regarding the method of use, as it can vary by product.

    Answers 1 · 2026.09.14

  • QWhat does it mean that acetylcysteine is also used for the liver?

    According to the ingredient description, acetylcysteine is also utilized in treating liver damage through its detoxifying action. This characteristic distinguishes it from other expectorants, and it also helps reduce cellular damage through its antioxidant effects.

    Answers 1 · 2026.09.14

See all questions

  • QHow does acetylcysteine thin mucus?

    Acetylcysteine thins mucus by breaking the bond between proteins within mucus, altering its chemical structure. As a result, it allows mucus to be easily expelled when coughing, making breathing more comfortable.

    Answers 1 · 2026.09.14

For anything that needs medical judgment, consult a doctor or pharmacist.

SourceKorea Ministry of Food and Drug Safety (Drug Safety Korea)

This drug information is based on data provided by the Korea Ministry of Food and Drug Safety.
Consult a doctor or pharmacist for accurate dosage, administration, and usage instructions.