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Detailed medicine guidance

Who can and cannot take Fybogel

NHS medicines information on who can take Fybogel and who may not be able to take it.

About this information

This NHS content is written for people in England. Medicine names, availability, prescribing and services may differ in other countries.

Who can take Fybogel

Most adults can take Fybogel, including while pregnant or breastfeeding.

Only give Fybogel to a child under 6 years old if it's been prescribed by a doctor.

Who may not be able to take Fybogel

Fybogel is not suitable for some people. To make sure it's safe for you, tell your doctor or pharmacist before taking Fybogel if you have:

  • ever had an allergic reaction to Fybogel or any other medicine
  • any changes in your poo, such as having blood in it, or how often you need to poo, which are unusual for you and has lasted longer than 2 weeks
  • tummy pain and you feel sick or are being sick, these could be signs of a blockage in your bowel
  • muscle weakness of the bowel (colonic atony)
  • difficulty swallowing or any throat problems
  • a rare genetic condition called phenylketonuria

View the original NHS website page ↗. Refreshed 19 August 2026.

Licensed under the Open Government Licence v3.0 ↗. MyPHU is independent and is not endorsed by the NHS.

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