Medicines & Supplements A to Z > Carbocisteine


Last updated on 24/03/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Carbocisteine 


BRAND NAME(S) IN HONG KONG: Carbocys, Expetan, Fluifort, Mucoprom (Contains Carbocisteine and Promethazine), Mucosin, Rhinathiol

DRUG CLASS: Mucolytic agent 

USED FOR: Cough with phlegm 

OTHER DRUGS IN THE SAME CLASS: Acetylcysteine, Ambroxol, Bromhexine, Dornase Alfa

– 375mg (tablets)
– 20mg/ml, 100mg/5ml, 200mg/5ml, 250mg/5ml (syrups)
– 2.7g (granules)

What is Carbocisteine for?

Carbocisteine belongs to a group of medications called mucolytic agents, which includes Acetylcysteine. It works by reducing the thickness of your phlegm so that it can be coughed out more easily. Therefore, it is most commonly used for treating wet cough.

How to use it?

Carbocisteine is taken by mouth in tablets or syrup form. The dosage for different age groups is as follows: 

Children aged 2-5
Take 100 mg twice daily or 62.5-125 mg 4 times daily. 

Children aged 6-11
Take 100-250 mg 3 times daily.

Children aged 12-14
Take 100-750 mg 3 times daily.

Children aged 15 or above and adults
Take 750 mg- -2.25 g daily in 3-4 divided doses. 

Please refer to the product insert for direction of use if you are taking Carbocisteine syrup.

What are the side effects of Carbocisteine?

Side effects are rare. Nausea, rash and stomach discomfort or bleeding may occasionally occur.

Who should not take Carbocisteine?

No specific situation or population in which carbocisteine should not be used has been reported.

Pharmacist Tips:

– Cough and common cold preparations are not recommended for young children (under 6 years old)
– Drinking more water, taking simple linctus or honey may help relieve coughing. Honey should not be given to children under the age of 12 months to avoid infant botulism.
– Many cough and common cold products contain multiple active ingredients, pay attention to them and do not overdose. 

Common dosing schedule:
Carbocisteine can be taken with or without food.

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Carbocisteine may interact with:
– Any medications that may inhibit cough,  e.g. Codeine

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Carbocisteine in Hong Kong?

In Hong Kong, Carbocisteine is an over-the-counter medicine which can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

Need more information?

For detailed information about the use of Carbocisteine in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.