Colon Cleansing - I now have diarrhea?

I am taking a product for colon cleansing. The first day was great as I had several normal bowel movements after almost a year of severe constipation. Previously I averaged using the toilet three times a week. Now, the third day into it I have severe diarrhea as well as some leakage. Should I continue, take a smaller dose or stop altogether? In case this is relevant I am using a product called OXY-POWDER.