1 day before your colonoscopy
Colonoscopy diet advice and bowel preparation
Take your regular morning medicines, unless you have been instructed otherwise.
Try to take your usual morning medicines before 10am and your evening medicines after 9pm. Your body may not fully take in medicines between these times. This is because of the bowel preparation solution that you will have.
If you need any advice about when to take your medicines, please contact the pharmacy medicines helpline on 020 7188 8748 (open Monday to Friday, 9am to 5pm).
Stop taking any bulk-forming laxatives (which create a heavy, more liquid-like poo that is softer and easier to pass). These include:
- isphaghula husk (such as Fybogel®)
- methylcellulose (Celevac®)
- sterculia (Normacol®)
Food and drink
Have a light breakfast, such as boiled egg on toast (white bread), no later than 9am.
After breakfast, do not eat any solid food until after your test.
Drink clear fluids only today. They may include:
- fizzy drinks
- clear strained soup
- clear stock
Try to drink 2 litres (about 8 to 10 glasses) in total throughout the day (not including the bowel preparation solution).
You can drink tea or coffee with a small splash of milk. Do not drink alcohol.
You need to start taking bowel preparation solution the day before your colonoscopy.
Please follow the instructions and timetable below for the solution that you are taking. Do not follow the instructions on the packet.
The solutions taste better if they are served chilled. You may want to mix the solutions in advance and keep them in the fridge. You need to use them within 24 hours of being prepared.
Take 4 senna tablets from the pack with a glass of water.
Mix 1 sachet of sodium picosulphate with 150ml of water. Do this in a large glass or jug, as the mixture may fizz over.
Stir the solution for 2 to 3 minutes. If the solution gets warm, allow it to cool before you drink it. You can add more water if you want to dilute the solution (make it weaker).
Please drink the preparation at once or, if you are drinking slowly, finish it within an hour.
Empty the contents of 1 sachet of Klean-Prep into 1 litre of water and stir until it is dissolved. Drink this over 1 hour to 1 hour 30 minutes.
Dissolve the second sachet of Klean-Prep and drink as above.
Dissolve the third sachet of Klean-Prep and drink as above.
- 1 sachet A and
- 1 sachet B
of Moviprep into 1 litre of water and stir until it is dissolved.
Drink this over 1 hour to 1 hour 30 minutes.
Ref number: 3993/VER2
Last reviewed: February 2019
Next review: February 2022
A list of sources is available on request