Medicines & Supplements A to Z > Smecta


Last updated on 18/10/2021.

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

GENERIC NAME: Dioctahedral Smectite


DRUG CLASS: Gastrointestinal drugs

SUB CLASS: Adsorbents

USED FOR: Acute diarrhoea

– 3g (sachets)

What is Smecta for?

Smecta is a brand product that contains Dioctahedral smectite, which acts as an adsorbent for the stomach. Not only does it adsorb free stool water, it also absorbs toxins and bacteria to provide protection for the mucus barrier.

How to use it?

Smecta is available in powder form as sachets. Different doses are used for different age groups.

In children:
For children under the age of 1 year: use 1 sachet daily.
For children from 1-2 years: use 1-2 sachets daily.
For children over the age of 2 years: use 2-3 sachets daily.

The sachet can be administered in 2-3 divided doses. The contents of the sachet can be mixed in a bottle with 50 ml of water or with a semi-liquid (e.g. broth, stewed fruit, mashed vegetables, baby food).

In adults:
Average of 3 sachets in 2-3 divided doses per day mixed in half a glass of water. In acute diarrhoea, you can use up to 6 sachets.

What are the side effects of Smecta?

Smecta is generally very safe and does not cause any side effects. In some severe cases, it may cause constipation.

Who should not take Smecta?

– People who are allergic to dioctahedral Smectite or any component of the formulation.
– People with fructose intolerance, ​​glucose and galactose malabsorption, or sucrase/isomaltase deficiency.

Pharmacist Tips:

– Due to its adsorbent properties, it may interfere with the absorption of other medicines and it is recommended to administer other medicine at least 2 hours apart with Smecta.
– If symptoms persist after taking Smecta, speak to your healthcare professional immediately. 

Common dosing schedule:
Smecta is recommended to be taken in between meals (after meals in oesophagitis patients).

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

Some common medications Smecta may interact with:
No known significant interactions

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

Where to buy Smecta in Hong Kong?

In Hong Kong, Smecta is an over-the-counter medicine and 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 Smecta 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.