I have had to clear out blockages when I did liver cleanses. Just doing a liver cleanse without doing the preparation described in the method used can be dangerous. One time I passed such large stones that they got stuck so I had to massage and push them along. I have to make sure I'm well hydrated or I can become constipated very rapidly and won't purge. I have more success if I take a magnesium laxative the night before the purge and take cascara sangrata the morning of the purge. Epsom Salts
tends to irritate my intestines so I add a tablespoon of Milk of Magnesia to the dose in 1 cup water (Clark's method).
One Dr. did warn me about blockages occuring because of a purge. I had enough experience doing them by that time to cope with a problem if it happened.