Colonoscopy Preparation: 5 Detailed Tips to Avoid Pain

Many people are anxious when scheduled for a colonoscopy, especially for the first time: they fear pain, are reluctant to use enemas, or don't know how to fast. However, what is more concerning is inadequate bowel preparation, which makes it difficult for doctors to observe small lesions, potentially leading to rescheduling the procedure. According to GLOBOCAN 2022, colorectal cancer causes nearly 2 million new cases globally each year, so timely and proper colonoscopy is crucial for early detection.

In this article, Tiptory helps you understand the steps for preparing for a colonoscopy: adjusting your diet, taking bowel-cleansing medication, and arranging a safe appointment time. These simple but correct colonoscopy preparation tips will ensure the examination goes smoothly, the doctor gets a clearer view, and you feel less stressed on the day of the procedure.

Part 1: What to prepare before a colonoscopy

Tip 1: Prepare early for an accurate colonoscopy

Get preparation instructions early

• Receive and carefully read the colonoscopy preparation instructions as soon as they are provided by your doctor or healthcare facility, ideally about 1 week before your appointment.

• Each person may require a different diet, bowel-cleansing medication, and timing for taking the medication. Therefore, strictly prioritize your doctor's specific instructions rather than relying on word-of-mouth advice.

Check medications currently in use

• Fully disclose all medications, supplements, and underlying medical conditions, especially if you are taking anticoagulants, diabetes medication, iron supplements, or blood pressure medication.

• Do not arbitrarily stop, change the dosage, or postpone taking medication. Your doctor will provide appropriate adjustment instructions to ensure a safe and accurate colonoscopy.

Allocate enough time and necessary items

• Read the instructions immediately upon receipt to have enough time to buy bowel-cleansing medication, arrange your diet, and start preparations according to the correct schedule.

• Note down any unclear points, such as fasting time, how to mix the medication, or whether you can take your regular medication, and ask the medical staff before your appointment day.

• This is one of the important colonoscopy preparation tips that helps achieve better bowel cleansing, supports the doctor in clearly observing any abnormalities, and reduces the likelihood of needing to repeat the procedure.

Confirm your appointment

• Double-check the date, time, and location of the procedure; ask for clarification on the required arrival time before the procedure.

• If you will be sedated, arrange for a family member or friend to drive you home and avoid driving yourself after the colonoscopy.

Tip 2: Ask your doctor before the colonoscopy day

Communicate openly to reduce anxiety

• Anxiety before a colonoscopy is very common, especially for those undergoing it for the first time. Write down your questions in advance and discuss them directly with your doctor to understand the procedure, potential sensations, and appropriate preparation.

• You can ask about: when you will receive the results, your last meal before the procedure, the duration of the colonoscopy, and what to avoid after receiving sedation.

• If questions arise after your consultation, call the healthcare facility instead of trying to find solutions from unreliable sources. This is a crucial colonoscopy preparation tip to help you prepare proactively and feel more at ease.

Review all medications you are taking

• Provide your doctor with a complete list of all prescription medications, over-the-counter drugs, vitamins, herbs, and supplements you are currently using.

• Individuals taking medication for diabetes, high blood pressure, cardiovascular disease, anticoagulants, or iron supplements need to inform their doctor early. Your doctor may request adjustments to the dosage or timing of medication to ensure safety and quality of the examination.

• Do not arbitrarily stop medication without specific instructions, as incorrect changes can affect your health or cause your colonoscopy to be rescheduled.

Ask for clarity on supplements

• Some supplements, such as fish oil, may need to be evaluated by your doctor before the procedure. Bring the product name, dosage, and duration of use for specific guidance.

• Following your doctor's instructions precisely is an important part of safe and accurate colonoscopy preparation.

Tip 3: Prepare essential items for the colonoscopy day

Prepare designated foods in advance

• Before your colonoscopy day, purchase the types of food and drinks allowed by the healthcare facility. Having suitable options readily available will help you adhere to the diet more easily when you start bowel cleansing.

• Common options include clear broths, clear jelly without dark colors, popsicles or shaved ice without dairy, water, tea or coffee without milk, clear electrolyte drinks, and clear carbonated soft drinks.

• Do not consume food, drinks, or jelly with red, purple, or blue colors if the colonoscopy facility advises against it. Food coloring can make it difficult to observe the inside of the colon.

• The list of permitted foods may vary depending on the protocol. Therefore, prioritize the specific instructions during your colonoscopy preparation.

Prepare supportive items when using laxatives

• It is advisable to have soft toilet paper or unscented wet wipes readily available for hygiene after each bowel movement. This helps reduce burning and discomfort when the bowel-cleansing medication starts to take effect.

• You can prepare suitable skin protective cream if you are prone to anal irritation, but consult a pharmacist or medical staff if you have skin lesions.

• Prepare toilet paper, loose clothing, clean water, and allocate time to stay near a restroom during the medication phase.

Make the bowel cleansing solution easier to drink

• If your doctor allows, you can chill the solution or add clear, non-red, purple, or blue flavorings to make it easier to drink.

• Drink the correct amount, at the correct pace, and within the instructed timeframe. Do not arbitrarily change how to mix or divide the laxative dose.

• This thorough preparation is one of the practical colonoscopy preparation tips that helps you adhere to the plan better and supports a smooth examination process.

Tip 4: Arrange safe transportation

Proactively arrange for someone to pick you up

• If you receive sedation or pain medication during your colonoscopy, you should not drive, ride a motorbike, or operate machinery after the procedure.

• Ask a family member or friend to accompany you or pick you up. Arranging this in advance helps you avoid being stranded after the procedure and ensures you have support if you still feel tired or drowsy.

Confirm regulations with the colonoscopy facility

• When scheduling, ask clearly if you will receive sedation, the required observation time after the colonoscopy, and the requirements for a pick-up person.

• Some facilities may require a responsible adult to directly pick you up. Therefore, do not assume that ride-sharing services are a suitable option unless approved by the facility.

Schedule time off after the procedure

• Take time to rest for the day and do not actively take on tasks that require high concentration or long-distance travel immediately after the colonoscopy.

• This is a simple but essential colonoscopy preparation tip that ensures a safe and smooth examination and initial recovery process.

Tip 5: Rest for the entire day after the colonoscopy

Proactively take the day off for the colonoscopy

• Arrange to take the entire day off work for your colonoscopy, especially if you receive sedation or pain medication.

• After the procedure, you may still feel drowsy, tired, or disoriented due to the medication and the fasting and bowel cleansing beforehand. Resting helps your body recover more comfortably.

Do not rush back to work

• Avoid working, driving, signing important documents, or performing tasks that require high concentration during the time your doctor recommends after the colonoscopy.

• Have a light meal ready as instructed, water, and a quiet space to rest when you return home.

Return to work when your body is stable

• Many people can resume normal activities and return to work the next day, but the appropriate time also depends on the type of medication used, the procedure's results, and your individual health condition.

• If your doctor finds abnormalities, takes tissue samples, or removes polyps, ask for clear colonoscopy preparation tips and post-procedure care instructions before leaving the healthcare facility.

Part 2: How to cleanse your bowels before a colonoscopy

Tip 1: Eat a low-fiber diet before colonoscopy

Start the diet at the correct time

• Follow a low-fiber or low-residue diet according to the timeframe instructed by the colonoscopy facility. Not everyone needs to start 3 days prior; the timing may vary depending on the protocol and the risk of inadequate bowel cleansing.

• The goal of this colonoscopy preparation step is to reduce the amount of residue in the bowel, helping the bowel-cleansing medication work effectively and allowing the doctor to observe the lining more clearly.

Temporarily restrict high-fiber foods

• During the designated period, typically avoid whole grains, raw vegetables, fruits with skin or seeds, dried fruits, legumes, nuts, and popcorn.

• Do not arbitrarily add prunes, prune juice, berries, or dark leafy greens right before the colonoscopy day, as these are all foods that can contain a lot of fiber or residue.

• Choose foods allowed by the healthcare facility, such as certain soft, low-residue options. The specific list may vary among facilities.

Monitor your diet to avoid confusion

• Read food labels, plan your menu in advance, and record what you've eaten if you find it difficult to control your portions.

• If you have chronic constipation, a history of inadequate bowel cleansing, or an existing digestive disease, inform your doctor early for specific guidance.

• Adhering to the diet is an important colonoscopy preparation tip; do not arbitrarily extend or shorten the low-fiber diet period without consultation.

Tip 2: Stop solid foods at the right time

Clearly identify the last meal

• Ask your doctor or healthcare facility for the exact time you need to stop solid foods before your colonoscopy. This timing depends on the colonoscopy time, the type of bowel-cleansing medication, and the protocol you are prescribed.

• Do not assume that everyone must stop solid foods for a full 24 hours. Some protocols allow a low-residue diet until a certain time, then switch to a clear liquid diet.

Adhere to the instructed fasting time

• After the time you need to stop solid foods, do not eat anything further, even snacks. This can increase residue in the bowel and affect the quality of observation.

• Only consume permitted liquids or liquid foods, in the correct amounts and within the timeframes specified in the colonoscopy preparation instructions.

• If you accidentally eat after the fasting cut-off time, contact the facility immediately for instructions. Do not decide to proceed with the colonoscopy or change the laxative dose yourself.

Prioritize safety and accurate results

• Inadequate bowel cleansing can make it difficult for the doctor to fully assess, cause the procedure to be delayed, or require it to be repeated.

• Clearly noting the last meal time, the start time for taking medication, and the stop time for liquid intake on the instruction sheet is a helpful colonoscopy preparation tip to avoid confusion on the day leading up to the examination.

Tip 3: Drink clear liquids before colonoscopy

Switch to a clear liquid diet as instructed

• During the period your doctor requests, only consume clear liquids or liquid foods. "Clear" means you can see through the liquid, and it contains no pulp, milk, or cream.

• Not everyone needs to consume clear liquids continuously for a full 24 hours. Follow the timing specified in your colonoscopy preparation instructions exactly.

Choose appropriate beverages

• Commonly permitted options include water, pulp-free apple juice, strained clear broth, tea or coffee without added milk/cream, clear electrolyte drinks, and clear carbonated soft drinks.

• Depending on the colonoscopy facility's instructions, you may be allowed to have jelly, popsicles, hard candies, or light-colored honey without dairy or pulp.

• Avoid pulpy juices, milk, cloudy beverages, alcohol, and any other drinks not on the permitted list.

Avoid dark-colored items

• Do not consume foods or drinks with red, purple, or blue colors if the colonoscopy facility advises against it, even if the product appears clear.

• These colors can cause confusion when the doctor observes the colon lining, thereby affecting the assessment during the colonoscopy.

Maintain adequate fluid intake

• Drink clear liquids in the amounts and at the times instructed to prevent thirst and fatigue and to help the bowel-cleansing medication work effectively.

• Adhere precisely to the stop time for drinking before the procedure. This is an important colonoscopy preparation tip to ensure safety when sedation is used.

Tip 4: Drink enough fluids during bowel cleansing

Drink clear liquids fully according to the protocol

• Bowel-cleansing medication causes frequent bowel movements, so it's essential to drink enough permitted clear liquids to prevent dehydration and exhaustion.

• Do not apply a fixed amount of water for everyone. Drink the exact amount of medication solution and supplementary fluids specified in the colonoscopy preparation instructions.

• Individuals with heart failure, kidney disease, edema, or those advised to restrict fluid intake should consult their doctor before increasing fluid consumption.

Divide intake into small amounts throughout the day

• Drink small sips or small cups steadily instead of trying to drink a large amount at once. This approach makes it easier to tolerate when hungry or nauseous.

• You can alternate between water, clear electrolyte drinks, clear broth, tea or coffee without milk, and permitted pulp-free juices.

• Only consume clear liquids and avoid red, purple, or blue colors if the colonoscopy facility requires it.

Recognize when to contact the healthcare facility

• Contact your doctor or the facility if you experience persistent vomiting, severe dizziness, inability to drink the entire bowel-cleansing solution, very little urination, or other unusual symptoms.

• Do not arbitrarily reduce the laxative dose or change the timing of medication. Completing the protocol correctly is a crucial colonoscopy preparation tip for effective bowel cleansing and avoiding rescheduling.

Note 5: Take the laxative at the correct time for the colonoscopy

Use the exact prescribed medication

• The doctor may prescribe bowel cleansing medication in powder, liquid, or tablet form. Use the correct medication name, dosage, mixing instructions, and accompanying water volume as indicated in the leaflet.

• Do not use additional laxatives, do not switch to other products, and do not reduce the dose because you are reluctant to have bowel movements. Inadequate bowel cleansing can lead to a postponed or repeated colonoscopy.

Adhere to the split-dose regimen

• Many regimens require taking part of the medication the night before and the remainder on the morning of the colonoscopy. The exact timing depends on your appointment time.

• With a split-dose regimen, the second dose typically starts a few hours before the procedure and must be completed by the doctor's specified deadline. Do not use 6:00 PM or any fixed time from someone else's instructions.

Make the medication easier to take while remaining safe

• If approved by your doctor, you can chill the solution or add clear, non-red, non-purple, non-blue flavoring to make it easier to drink.

• Drink additional clear liquids as instructed and stay near a restroom after starting the medication.

• If you experience excessive vomiting, severe abdominal pain, dizziness, or cannot complete the medication, contact the endoscopy center immediately. This is a pre-colonoscopy tip that should not be overlooked.

Note 6: Stay near a restroom after taking the medication

Proactively stay home after taking the laxative

• Bowel cleansing medication often causes frequent bowel movements for several hours. After starting the medication, you should stay home or in a location with convenient restroom access.

• Avoid traveling far, attending long appointments, or using public transportation while the medication is active.

Wear comfortable, easy-to-change clothes

• Choose loose, soft, easy-to-remove clothing to minimize inconvenience when needing to use the restroom urgently.

• It is advisable to stay in a room near the restroom, and have soft toilet paper, unscented wet wipes, and permitted drinking water readily available.

Complete the medication as instructed

• Loose stools are a common effect of bowel cleansing medication. Continue taking the medication and clear liquids according to the regimen until completed.

• If you experience severe abdominal pain, continuous vomiting, or side effects that prevent you from finishing the medication, contact a medical facility. This is a crucial pre-colonoscopy tip to ensure timely treatment and guarantee the quality of the colonoscopy.

Note 7: Reduce skin irritation during bowel cleansing

Clean gently after each bowel movement

• Frequent bowel movements when using bowel cleansing medication can cause burning or irritation in the anal area. You can use soft, unscented, alcohol-free wet wipes to clean gently.

• If not using wet wipes, you can wash with clean water and then pat dry with a soft towel. Avoid rubbing vigorously as this can make the skin more uncomfortable.

Prepare skin protection tools in advance

• Have soft toilet paper, appropriate wet wipes, and a waste bag ready next to the toilet.

• If your skin is easily irritated, ask your pharmacist or medical staff about suitable skin protection products before use.

Do not flush wet wipes down the toilet

• Dispose of used wet wipes in a trash can or sealed trash bag, even if the product label says they are flushable.

• This helps prevent blockages and keeps the restroom area clean during the pre-colonoscopy preparation.

Note 8: Enema when directed by a doctor

Only perform when specifically instructed

• An enema is not a mandatory step for everyone before a colonoscopy. Only use it when requested by your doctor or endoscopy center.

• Ask for clear instructions on the type of solution, when to perform it, and how to use it. Do not self-purchase or reuse old products without being directed to do so.

Use correctly and for the intended purpose

• Follow all product instructions and medical staff's advice. If you have kidney disease, heart disease, electrolyte imbalance, or are taking medication, you must inform them before performing an enema.

• Enemas primarily help cleanse the lower bowel; they do not replace the oral bowel cleansing medication prescribed by your doctor.

Contact immediately if there are any unusual signs

• Stop the procedure and contact a medical facility if you experience severe abdominal pain, rectal bleeding, dizziness, or cannot retain the solution as instructed.

• Following instructions is a crucial pre-colonoscopy tip to ensure safe and effective preparation.

Note 9: Stop drinking fluids at the correct time

Confirm the stop-drinking time with the endoscopy center

• Ask for the exact time you must stop all fluids before your colonoscopy. Many protocols allow clear liquids until at least 2 hours before the procedure, but some facilities have stricter regulations.

• Only the time specified in the instructions from the facility where you are having the procedure applies to your colonoscopy schedule.

Do not drink after the requested time

• When the fluid cut-off time arrives, do not drink water, tea, coffee, electrolyte drinks, suck on hard candies, or any other beverages, unless specifically instructed otherwise by your doctor.

• Adhering to this deadline helps ensure safety when using sedatives or anesthesia. If you accidentally drink after the specified time, you must notify the endoscopy center immediately.

Continue to avoid solid foods

• Do not eat solid foods after the instructed time, including snacks or light meals.

• This is an important pre-colonoscopy tip for a smooth bowel cleansing process and procedure.

Final check before colonoscopy

Monitor bowel cleansing effectiveness

• After taking bowel cleansing medication, stool usually changes from containing residue to being more liquid, then becomes pale yellow or clear fluid, with no visible food particles.

• If you still have significant residue in your stool, cannot finish the medication, or experience discomfort that prevents you from completing the regimen, contact the endoscopy center for guidance.

Strictly adhere to food and drink cut-off times

• Do not eat solid food after the time requested by your doctor. Do not self-eat because you feel hungry or tired.

• Only consume permitted clear liquids and stop drinking at the instructed time.

• Avoid red, purple, or blue drinks or foods if required by the endoscopy center, as they can make it difficult to observe the inside of the colon.

Prioritize specific instructions from your doctor

• If you have not received an instruction sheet, contact the endoscopy center before starting preparation. Do not rely solely on online instructions or others' experiences.

• Each pre-colonoscopy preparation regimen may vary depending on your appointment time, underlying health conditions, current medications, and history of bowel cleansing.

Understand results and biopsies correctly

• Doctors can usually discuss initial findings immediately after the procedure, once you are awake. Tissue biopsy results may take several days or longer, depending on the facility.

• If polyps or abnormal mucosal areas are found during the colonoscopy, the doctor may take a biopsy sample or remove polyps for testing. Schedule a follow-up appointment to have the results explained and to discuss further monitoring.

References

1. American College of Gastroenterology. (2025). Colonoscopy. American College of Gastroenterology.
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3. Hassan, C., East, J., Radaelli, F., Spada, C., Benamouzig, R., Bisschops, R., et al. (2019). Bowel preparation for colonoscopy: European Society of Gastrointestinal Endoscopy guideline update 2019. Endoscopy, 51(8), 775–794.
4. Jacobson, B. C., Anderson, J. C., Burke, C. A., Dominitz, J. A., Gross, S. A., May, F. P., et al. (2025). Optimizing bowel preparation quality for colonoscopy: Consensus recommendations by the US Multi-Society Task Force on Colorectal Cancer. American Journal of Gastroenterology, 120(4), 738–764.
5. National Institute of Diabetes and Digestive and Kidney Diseases. (2023). Colonoscopy. U.S. Department of Health and Human Services, National Institutes of Health.
6. Saltzman, J. R., Cash, B. D., Pasha, S. F., Early, D. S., Muthusamy, V. R., Khashab, M. A., et al. (2015). Bowel preparation before colonoscopy. Gastrointestinal Endoscopy, 81(4), 781–794.
   

Content edited by: Rene Lee Nguyen.

Information reviewed and verified by expert: Matthew Turner.