Are colon cleansers a big mistake?

I am considering trying a colon cleansing system.  This will be my first time.  Are the a big mistake or a great idea to promote better overall health? I take medications daily for thyroid, B.C., and A.D.D.

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Colon cleanse is a procedure for preparing to bowel investigation or surgery. It has its side effects, one is that it can derrange your intestinal flora, or trigger IBS or other silent abdominal disease.