Before the procedure
In order for your doctor to get the best possible view and make the colonoscopy easier, your large bowel needs to be cleaned out. How this is done is explained on a separate page, detailing the preparation for colonoscopy. You need to have nothing to eat or drink for 4 hours before the procedure is done, however you make take medications with a sip of water.
Some medications may need to be stopped for up to a week before the procedure. These might include iron tablets, aspirin, clopidogrel, anti-inflammatory drugs. If you have significant heart disease, such as previous heart attacks or coronary stents, you will probably need to continue on your aspirin and/or clopidogrel, so please make sure you discuss this with your doctor.
If you have diabetes, valvular heart disease, a permanent pacemaker or are taking blood thinning medications such as warfarin, dabigatran or rivaroxaban it is important to discuss this with your doctor before you colonoscopy is organised as special arrangements may be necessary.