Medicines & Supplements A to Z > Dulcolax


Last updated on 19/10/2021.

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



DRUG CLASS: Laxatives

SUB CLASS: Stimulant laxatives

USED FOR: Constipation

– 5mg (enteric-coated tablets)

What is Dulcolax for?

Dulcolax is a brand product that contains Bisacodyl, which is a type of stimulant laxative. It works by activating the intestines to contract more, hence stimulating a bowel movement. It is used to treat constipation.

How to use it?

Dulcolax is available as tablets. Different doses are used for different age groups.

For adults and children over 10 years of age: take 1-2 tablets once daily. The tablet should be swallowed whole with a glass of water at night. 

For children 4-10 years of age: take 1 tablet once daily. The tablet should be swallowed whole with a glass of water at night.

What are the side effects of Dulcolax?

Common side effects of Dulcolax include stomach cramps, nausea, and vomiting.

Who should not take Dulcolax?

– People with intestinal obstruction
– People with active infectious diarrhea

Pharmacist Tips:

– Do not use more than 7 days as it could cause the bowel to slow down and cause more persistent constipation.
– A bowel movement should normally take place after about 6-12 hours of taking the tablet.
– Take antacids or milk products separately at least 1 hour apart with Dulcolax.

Common dosing schedule:
Dulcolax should be taken at night with a glass of water. Do not chew or crush the tablets.

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

Some common medications Dulcolax may interact with:
– Antacids

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

Where to buy Dulcolax in Hong Kong?

In Hong Kong, Dulcolax 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 Dulcolax 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.