I've have been on 2 different commercial cleanses and they both say that constipation can be a common side effect when starting these cleanses. Both of these programs recommended taking an instestinal cleanser with their products. Dr. Schulze 's intestinal cleanser #1 and Chomper (produced by Arise and Shine) are 2 products I have used. They say to increase the dosage until you are haveing 3 to 5 bowel movements a day. These products are pretty expensive, if you cannot afford these try looking at the healthfood store for and herbal laxative. Also, they recommend taking enemas (as remi mentioned above).