I've been using it on and off for a few years now. Sometimes for long periods of time... I have thyroid issues which can cause constipation regardless of diet. So there were times when I've used it for months at a time. I didn't have any problems doing this. I also did it every other day when it seemed it was coming out more regular. I also take 4 caps.
Your BMs won't be "normal" on Oxy. It's supposed to melt them. You're supposed to drink a lot of water and the more water you drink the more watery they get. So it's working for you.. as gross as it is.
If you rather have normal stools than use something like Colonix which has psylium/fiber which gives a normal/solid bm.