NZ Formulary

Sennoside B

sen-o-side bee

What does it do?

Sennoside B is used to treat and prevent constipation.

How should you take it?

Take sennoside B as directed with a glass of water.

What if you forget a dose?

If you take sennoside B regularly and it is nearly time for your next dose, skip the missed dose and take your next dose at the usual time. Otherwise, take the missed dose as soon as you remember. Do not take two doses at the same time.

Can you take other medicines?

Some medicines available without a prescription may react with sennoside B including:

  • anti-diarrhoea medicines such as loperamide (e.g. Imodium®)
  • other laxatives – discuss this with your pharmacist

Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products or recreational drugs.

What side effects might you notice?

Side EffectsRecommended action

Stomach cramps, diarrhoea

Tell your doctor if troublesome

If you notice any other effects, discuss them with your doctor or pharmacist.

Other information:

  • Tell your doctor if you have other stomach or bowel problems.
  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.
  • Do not use sennoside B for longer than 1 week unless told to by your doctor.
  • If you have noticed a change in bowel habit that continues for longer than 2 weeks, talk to your doctor before taking sennoside B.
  • Sennoside B may make your pee and bowel motions an orange-red colour - this is harmless.
  • Drink plenty of fluids while taking sennoside B.