Digestive health · Bulk-forming laxative / dietary fibre supplement
Psyllium husk (Isabgol / Ispaghula)
Isabgol is a natural bulk-forming fibre used to soften stools, promote regular bowel movements, and support digestive health.
OTCKidney warningSenior precautionOverview & typical uses
Isabgol is a natural bulk-forming fibre used to soften stools, promote regular bowel movements, and support digestive health.
Primary uses
- Gentle relief of constipation
- Support for fibre intake in low-fibre diets
- Symptom relief in some bowel conditions (under clinical guidance)
How it works
Absorbs water in the intestine to form a soft, bulky stool. Encourages natural bowel movement without strong stimulation.
Available forms & strengths
- Husk powder (Oral)
- Effervescent granules (Oral)
General precautions & contraindications
Do not use if
- Bowel obstruction or difficulty swallowing
- Severe strictures of the digestive tract
Pregnancy
Generally considered safe. Not absorbed; considered safe.
Breastfeeding
Generally considered safe. Not absorbed; safe during breastfeeding.
Kidney considerations
- No dose adjustment needed for routine use.
Paediatric use
Suitable from about 6 years with full fluid intake.
Older adults
Watch for choking or blockage if taken with too little water.
Common side effects
- Bloating and gas (settles as your body adjusts)
- Mild abdominal discomfort
Serious warnings — seek help if these appear
- Bowel or oesophageal blockage if taken with too little fluid
- Serious allergic reaction (very rare)
Drug interactions
Fibre may reduce absorption — take other medicines 1 to 2 hours apart.
Food & alcohol precautions
Always take with a full glass of water (about 250 mL) to avoid blockage.
Storage, missed dose & overdose
Storage
Store in a dry place below 25 °C, out of reach of children.
If a dose is missed
Take when remembered — no fixed schedule.
Overdose
Excessive use can cause bloating, gas, and blockage. Increase fluids and seek help if severe.
Frequently asked questions
Many people take it in the morning or before bed with a full glass of water.
Medical references
- British National Formulary — Ispaghula husk — BNF (NICE)
Content last reviewed: 2025-01-01
Medical disclaimer
This information is for educational purposes only and should not replace professional medical advice. Please consult a licensed pharmacist or clinician for advice tailored to your personal circumstances.