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Preparing for colonoscopy
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A colonoscopy is a procedure that lets a doctor look inside your large bowel (colon) using a thin, flexible tube with a camera. Preparing for it means cleaning out your bowel so the doctor can see clearly.
Key facts
Yes, colonoscopy is a common procedure, often done for screening or to investigate bowel symptoms.
People of all ages may need a colonoscopy, but it is most often recommended for adults over 50 or those with bowel symptoms.
A colonoscopy allows the doctor to visually examine the inside of your colon and take tissue samples (biopsies) if needed.
You will be given medication to help you relax. The procedure takes about 30 minutes. You need someone to take you home after.
Preparation involves cleaning your bowel so the doctor can see clearly. This typically requires a special diet and a bowel-cleansing solution.
Your doctor will prescribe a bowel-cleansing solution. You will take it in divided doses, usually the day before and the day of the procedure. It will cause diarrhoea to empty your colon. You may also need to adjust your regular medicines, such as blood thinners or diabetes medications, as directed by your doctor. Do not stop any medication without consulting your doctor.
After your colonoscopy, you may feel a little bloated or have mild cramps. You can usually return to normal activities the next day.
A diet rich in fruits, vegetables, and whole grains supports bowel health. Regular exercise also helps maintain a healthy digestive system.
Waiting for results of a colonoscopy can be stressful. It is normal to feel anxious. Talking to your doctor or a counsellor can help.
You cannot prevent all conditions that require a colonoscopy, but a healthy lifestyle may reduce your risk of bowel cancer.
Screening colonoscopy is recommended for people at average risk starting at age 50, or earlier if you have a family history. Talk to your doctor about when to start.
Most colonoscopies are completed successfully. Following the prep instructions carefully gives you the best chance of a clear exam.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 16, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.
Colonoscopy itself is not surgery, but if polyps are found and removed, that is done during the procedure. If a large polyp or cancer is found, additional surgery may be needed later.