Making prep tolerable
In short
Most of what makes bowel preparation hard is taste, volume, and the cold dread of starting. None of these are fixed. Chilling the solution, drinking through a straw, sipping a permitted clear liquid between cups, sucking on a piece of hard candy, and pacing yourself in fifteen-minute intervals all genuinely help. None of it changes how the prep works. All of it changes how the next few hours feel.
What this page covers
Practical, specific advice for making a bowel preparation easier to drink and easier to live through. Some of these suggestions come from clinical trials, some from years of nursing experience, and some from common sense. They are framed for an adult sitting on the edge of the bath at half past nine in the evening, looking at a litre of solution and wondering how to start.
- Taste, temperature, and the small adjustments that change the chemistry of swallowing
- How to pace the drinking so you actually finish
- What to do about nausea
- How to set up the bathroom so the night does not feel like punishment
- What helps with the skin, the cold, the boredom, and the shame
Taste and temperature
Most modern preparations are designed to be palatable. Most are not. The salt content of polyethylene glycol (PEG) solutions and the bitterness of sulfate-based preparations are limits of the chemistry, not failures of the manufacturer. You cannot make them taste good. You can make them taste less bad.
Chill the solution thoroughly before you start. A solution at refrigerator temperature is markedly easier to drink than one at room temperature, because cold suppresses some of the bitter and salty notes and reduces the volatile aromatic compounds that the nose picks up before the tongue does. Most preparations can be safely chilled — check the leaflet for your specific product, since a small number say otherwise.
Drink through a straw, and place the straw at the back of your tongue rather than the front. The taste receptors for bitter and salt are concentrated on the front and sides of the tongue. A straw bypasses much of that real estate. A wider straw is better than a narrow one.
Have a chaser ready: a small glass of a permitted clear liquid that you actually like. Apple juice, white grape juice, ginger ale, lemon-flavoured sports drink, weak black tea, or plain cold water all work. Take a mouthful of the prep, swallow without lingering, and immediately follow it with a sip of the chaser. The chaser is not for hydration — that is what the prep itself supplies — it is for taste.
Some people find that sucking on a piece of hard candy, a ginger candy, or a slice of lemon between cups of prep helps reset the palate. Mints work for some, not for others. Anything red or purple is excluded — dyes can be mistaken for blood at the procedure.
Pacing
The instinct, when faced with a litre of unpleasant fluid, is either to drink it as fast as possible to be done, or to put it off, sip by miserable sip. Neither approach works well. Drinking too fast tends to provoke nausea and vomiting; drinking too slowly stretches the discomfort and reduces the cleansing.
The protocols printed on the box generally call for a glass of solution every ten to fifteen minutes, finishing the dose over an hour or two. Set a timer. Pour the next glass into a measured cup at the start of each interval. When the timer goes, drink it down without ceremony and reset the timer. The visual progress — fewer glasses ahead, more behind — is more useful than people expect.
If you fall behind, do not try to catch up by drinking faster. Carry on at the original pace and finish a few minutes late. The total volume matters more than the precise minutes.
Nausea
Nausea during prep is common, and rarely dangerous. The simplest first move is to slow down, take a fifteen-minute break, and resume. Walk around the room. Open a window. Wash your face with cold water.
If you are warm, cool down. If you are cold, put on a sweater — being cold while drinking a cold solution at speed is a reliable trigger for the gag reflex. Sit upright rather than slumped on the sofa. Some people find that sucking on a peppermint, or sipping flat ginger ale, helps the stomach settle.
If you have vomited a small amount of the solution and the nausea has eased, you can usually resume after a fifteen- to thirty-minute break. If you have vomited a large amount, or are vomiting repeatedly, stop and call the unit. They will tell you whether to continue, what to do about the dose you lost, and whether the procedure can still go ahead.
Some people are prescribed an anti-nausea medication to take with the prep, particularly if they have struggled with prep before, have severe motion sickness, or have a history of chemotherapy nausea. This is worth raising at the booking visit, not at midnight.
Setting up the bathroom
The bathroom is where you will live for several hours. Make it comfortable.
Stack soft toilet paper within reach. Wet wipes — labelled flushable or, better, kept in a small bin beside the toilet — are kinder to the skin than dry paper after the tenth or twentieth trip. Unscented baby wipes are good. A small tube of barrier cream (zinc oxide, or a thin layer of petroleum jelly) applied early prevents the worst of the soreness; reapply when the skin starts to feel raw rather than waiting until it is.
Keep a bottle of water and your phone charger within reach of the toilet. If you read, bring a book or load something light onto a tablet. If you watch, queue up something undemanding before you start. The point is not to be entertained. The point is to be occupied while the prep does its work.
Wear loose, easy clothing — pyjama trousers with an elastic waist, a long shirt. People who try to keep their normal evening clothes on tend to regret it.
The cold, the cramping, and the rest of it
Many people feel cold during a heavy prep, particularly when drinking chilled solution. A small electric heater pointed at the bathroom, or a hot water bottle held against the lower abdomen between trips, helps. Warm socks help more than people expect.
Cramping is normal at certain points of the prep, especially as the colon starts to empty in earnest. It is uncomfortable but not dangerous; it usually eases after a bowel movement. Walking around the room rather than sitting still sometimes helps. Heat on the abdomen helps. Severe cramping that does not let up, or pain that is sharp rather than crampy, is worth calling the unit about.
If your skin is sore by the morning, a brief warm shower (not a hot one), patting dry rather than rubbing, and another layer of barrier cream is the standard recovery. The skin is resilient and almost always normal again within a day or two.
Sleep, work, and the rest of life
Do not plan to do anything in the evening of your prep. Cancel the meeting, the dinner, the call. Most people are fine sitting on the sofa or in bed; few are fine cooking, working, or socialising. If you have small children, arrange for someone else to be in charge that evening if you possibly can.
Sleep, when it comes, will be broken. Set the second-dose alarm and accept that the few hours between doses are a holding pattern, not a real night's sleep. Plan to nap when you get home from the procedure. Do not schedule anything important for the rest of that day.
What to ask your clinician
- If I have struggled with prep before, is there a different preparation I could try this time?
- Could I be prescribed an anti-nausea medication to take alongside the prep?
- Are there any of my regular medications that I should pause around prep day, and which I should continue?
- Are there flavours or mixers your unit recommends or specifically advises against for the brand I have been prescribed?
- If I cannot drink the full volume, what is the cut-off below which I should call the unit?
- What number do I call after hours if something goes wrong?
Common worries, briefly addressed
I gagged and could not finish a glass.
Take a fifteen-minute break, rinse your mouth with cold water, and try a smaller volume next time — half a glass instead of a full one, more frequently. Cold and a straw at the back of the tongue help. Most people who pause and reset can finish.
Can I add a flavour packet, lemonade powder, or squash to the solution?
Some preparations come with their own flavour sachets and are designed to take them. For others, a small amount of a clear, non-red, non-purple flavouring is usually fine, but check the leaflet for your specific product or call the unit. Avoid anything with pulp, fat, or dye.
I am hungry and miserable.
This is real and it is the part most people understate when they describe the experience. Permitted clear liquids — broth, plain gelatin, ice pops without dairy or fruit pulp, ginger ale, apple juice — help. A warm cup of clear broth is the closest thing to a meal you have access to, and is worth using.
Should I be drinking water as well as the prep?
Yes, within the limits of your specific protocol. Most prep instructions include extra clear liquids in addition to the prep solution itself. Hydration is not optional and the prep alone usually does not provide enough. Stop only when the cut-off your unit specified for clear liquids is reached.
I am crying. Is this normal?
Yes. It is a long, undignified evening, often after a long anxious week. The prep itself does not cause distress, but exhaustion, low blood sugar, and lack of privacy can. Once the procedure is done, this fades quickly.
Sources
- American Society for Gastrointestinal Endoscopy and U.S. Multi-Society Task Force on Colorectal Cancer — guidelines on bowel preparation
- European Society of Gastrointestinal Endoscopy — bowel preparation guideline
- American Gastroenterological Association — patient education materials on coloscopy preparation
- British Society of Gastroenterology — bowel preparation guidance
- Canadian Association of Gastroenterology — patient information on coloscopy