I have had to take daily enemas for about 18 years due to chronic constipation. Oxy-Powder on 3 capsules a day has got my bowels moving normally for the first time in 18 years, and I have now stopped doing daily enemas. Its a miracle.
A word of warning: oxy-powder doesn't work, at least in my case, unless I take it on a completely empty stomach. 2 hours after food is not sufficient for me. I need a minimim of 4 hours space after food for this to be effective.