Medicines & Supplements A to Z > Senokot


Last updated on 19/10/2021.

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

GENERIC NAME: Senna / Sennoside B


DRUG CLASS: Laxatives

SUB CLASS: Stimulant Laxatives

USED FOR: Constipation

– 7.5mg (tablets)

What is Senokot for?

Senokot is a brand product that contains Senna (sennoside B), which is a type of stimulant laxative. It stimulates bowel movement by increasing the activity of the intestines, hence used to treat constipation. Senokot normally works in 8-12 hours.

How to use it?

Senokot is taken orally as tablets. Dose can be repeated on a daily basis until bowel action is restored.

For adults and children over 12:
2-4 tablets once at bedtime, in order to have a bowel movement the next morning. Initially, start at a low dose and slowly increase. 

For children between 6-12:
1-2 tablets once at bedtime, in order to have a bowel movement the next morning. Initially, start at a low dose and slowly increase.

What are the side effects of Senokot?

Common side effects of Senokot include stomach discomfort and diarrhoea.

Who should not take Senokot?

People who are allergic to any component of Senokot.

Pharmacist Tips:

– Senokot is solely used for constipation, not for any other indications like weight management.
– Avoid long-term use as it may cause slowing down of bowel movement after withdrawal. If there is no bowel movement after three days of use, consult your doctor.

Common dosing schedule:
Senokot should be taken at bedtime in order to provide overnight relief of constipation.

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

Some common medications Senokot may interact with:

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

Where to buy Senokot in Hong Kong?

In Hong Kong, Senokot 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 Senokot 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.