Colon cleansing is an invasive procedure which should only be done after full consultation with your doctor and under the direction and supervision of a qualified and experienced medical professional.
Many doctors and other medical professionals are not in favor of colon cleansing as a measure for better health or for prevention of disease. They recommend colon cleansing only in preparation for a medical examination or procedure. These doctors say that cleaning of the colon is a natural process that your body usually does better by itself.
Most people do not have to take special supplements, enemas, or pills to eliminate body waste material or bacteria.
Since your colon absorbs sodium and water and is responsible for maintaining the electrolyte balance in your body, such cleansers could disrupt the natural balance. This might lead to salt depletion and cause dehydration. This might also encourage the development of serious ailments like heart failure, malnutrition or anemia.
Some doctors may advise that a better approach might be to eat a fiber-rich diet with sufficient water taken each day to help to keep your body free of constipation and resultant colon problems.
Self-administration should only ever be done if you have the approval of your doctor.
People who are recovering from cancer treatments, inflammatory bowel diseases (like Crohn's disease or ulcerative colitis) and pregnant women should not undergo any colon cleansing programs at all.
Source of Information : Your Guide to Colon Cleansing by By Peter Mason