I too have tried this, but I have only gotten my fizz from Alka-Seltzer. I get a big box that has 2 tablets in a foil packet. I keep them by the bed, and when I want an extra kick after filling up, I reach over, open a pack, and then pop the 2 tablets up the ass.
Yep, the feeling is often out of this world. There's a lot of gurgling right in the rectum, and then usually a big burst of bubbles coming up the left side of the colon. Sometimes it goes on and on.
So, to all the nay-sayers who are always against anything but their own way to do enemas, I figure this is pretty safe. After all, like the vitamins, it's made for you to drink. Just after letting it fizz out in a glass. The medicine in the stuff is mostly aspirin, and in any case, it's coming out pretty darn soon, in most cases.
So, if you have an open mind, open up your bottom for some fizz tablets. I've got some Airborne around, and may just try than...