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Ispaghula husk is a bulk-forming fibre laxative for constipation.
What should I know about Ispaghula Husk?
It adds bulk and fluid to stools, and usually takes 2 or 3 days to work. Mix it with water, and drink plenty of fluids.
What are the side effects?
Wind and bloating are the main side effects. Mild allergic reactions can occur, so avoid breathing in the powder.
Who should check first?
Ask your pharmacist if you have a medical condition or take other medicines.
When should I get help?
See a doctor if constipation continues. Call your local emergency number (000 in Australia) for swelling of the throat or tongue, or trouble breathing.
Doses vary, so follow your prescriber, pharmacist and the medicine label. In Australia, call 000 in an emergency. Outside Australia, use your local emergency number.
Source: NHS: About Fybogel (ispaghula husk). General education does not replace individual medical advice. Updated November 2026.
Explore our health guides and medicine FAQs. Medicine availability and product instructions vary by country; follow the leaflet supplied with your medicine.