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Before the camera goes in

Bowel Prep Before Your — Colonoscopy

Bowel preparation is the part most people worry about more than the procedure itself. That worry is reasonable — it is genuinely uncomfortable. This page tells you exactly what to expect and how to get through it.

Medically reviewed by Dr. Muralidhar Muddusetty, Surgical Oncologist, MBBS (AIIMS) · MS Surgery (AIIMS) · DNB Surg Onc · MRCS (Edinburgh) · Last reviewed September 2026

  • The prep is the hard part — Most people find the laxative drink harder than the procedure itself. Knowing what is coming makes it easier to manage.
  • Diet changes the day before — Low-fibre foods prepare the colon before the laxative solution begins that evening.
  • Tell your team if you struggle — If you cannot finish the prep, call before skipping the appointment. There are options.
  • Plan your evening at home — The solution acts quickly for most people, and the effects are best managed close to a toilet.
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Bowel preparation clears the colon so the doctor can see the lining and take a biopsy if needed. It involves eating only low-fibre foods the day before and then drinking a prescribed laxative solution that flushes the colon clear. Your team will give you the specific instructions for your preparation.

What does bowel prep actually involve?

Bowel prep has two parts: a change in what you eat, and a laxative drink your doctor prescribes. Both matter because even small amounts of remaining stool block the camera's view and can mean a lesion is missed.

The day before your procedure you eat only foods that leave no residue in the gut — a low-fibre or low-residue diet. Plain white rice, white bread, boiled eggs, and clear soups are typical examples. Your team will give you the full list in writing.

In the evening you begin drinking the prescribed laxative solution. It works by drawing water into the colon and flushing it clear. For a split-dose preparation, some of the solution is saved for the early hours of your procedure morning.

How do you get through the laxative drink?

Most people find the volume of liquid the hardest part. The solution is not painful, but drinking a large quantity over a short time is unpleasant, and nausea is common.

Keeping the solution cold and drinking it through a straw helps many people. If nausea comes, pause briefly and then continue slowly. Going slowly is better than stopping altogether.

Plan your evening at home with easy toilet access. The solution acts quickly for most people, and the urge can be sudden. Keep gentle wipes nearby to manage any skin soreness from frequent toilet trips.

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What if you cannot finish the prep?

Tell your team. Do not cancel the appointment without calling first — your doctor can advise whether to come in anyway, try a different preparation, or reschedule.

If you have a condition that makes standard prep difficult — such as kidney problems, heart conditions, or difficulty swallowing — tell your team before your prep day, not on the day itself. Alternatives exist, and your team needs time to arrange them.

What does the prep look like, step by step?

  1. Several days before

    Ask your team about any regular medicines you take. Some need to be paused or timed differently before a colonoscopy. Never stop a prescribed medicine without being told to.

  2. The day before

    Switch to the low-fibre diet your team has given you in writing. Drink plenty of clear fluids throughout the day to stay hydrated before the laxative begins.

  3. Evening before

    Begin drinking the laxative solution as instructed. Stay close to a toilet. The first bowel motion usually comes on quickly after starting.

  4. Morning of the procedure

    If you have a split-dose prep, drink the remaining portion at the time your team specified. Do not eat solid food. Continue only the clear fluids your team has approved.

  5. At the hospital

    Tell your nurse honestly how the prep went. If it was difficult or incomplete, say so before the camera is inserted — it affects what the doctor can safely do.

What do the words on your prep sheet mean?

Low-fibre diet
A way of eating that leaves very little material in the gut. White rice, white bread, boiled eggs, and clear broth are common examples. Your team gives you the full list.
Clear liquid
Any fluid you can see through — water, strained broth, or clear fruit juice without pulp. You will usually be restricted to these in the hours before prep begins.
Split-dose prep
Dividing the laxative drink into two portions: one taken the evening before and one taken early on the morning of the procedure. Most teams prefer this because it tends to produce a cleaner result.
Clear effluent
When the fluid passing from your bowel is pale yellow and transparent — not brown or cloudy — the colon is likely empty enough. Your nurse will ask whether you reached this point.
Conscious sedation
A light sedative that some teams offer to reduce discomfort during the procedure. Whether it is available and whether it suits you is a question for your treating team.

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Common questions

Frequently asked questions

Can I eat or drink anything the morning of the procedure?

You cannot eat solid food from the evening before. Clear fluids are usually allowed until a few hours before your procedure time, but the exact cut-off depends on your team's instructions. Follow the written guidance your team gave you — it is specific to your prep type and your procedure time. If anything is unclear, call the centre the day before rather than guessing on the morning.

Do I need to stop my regular medicines before the prep?

Some medicines need to be paused and others need to be taken at a different time. This depends on the specific medicine and your other conditions, so it is not a decision to make yourself. Bring a list of everything you take — including supplements and herbal preparations — to your pre-procedure appointment, or call ahead. If you cannot reach anyone on your prep day, take your usual medicines with a small sip of water and tell your team when you arrive.

How long does the diarrhoea last once I start the solution?

The active clearing settles gradually as the colon empties. For most people the urgency reduces well before their procedure time, and by morning the only thing passing is clear fluid. If you are still having frequent or urgent motions on the day of the procedure, tell your team before you go in.

How do I know whether the prep has worked?

Watch the colour and clarity of what passes. When the fluid is pale yellow and you can see through it clearly — not brown, not murky, not thick — the colon is likely clear enough. Your nurse will ask about this when you arrive. Tell them honestly, because an incomplete prep affects what the doctor can safely do.

What if I vomit during the prep?

Stop drinking for a short while, sip some water, and then try again more slowly. If vomiting continues and you cannot finish the solution, call your team. Do not simply skip the appointment — your team may be able to suggest an alternative preparation, adjust the plan, or reschedule before your slot is wasted.

Can I drive myself home after the procedure?

If sedation is used during the procedure, you must not drive for the rest of that day and you need someone to take you home. If no sedation is offered, restrictions may differ. Ask your team what applies to your specific plan before your prep day, not on the day itself, so you can arrange transport in advance.

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