Well, not benefiber. but, miralace and metimucil and similar off brand stuff. And I'll take them for days and days, nothing but gas like you've said, so awful! I've even had to take as many as 3 or 4 big Tablespoons .. doses of Milk of Magnesium, which makes almost 2/3 of a cup. Then in about 4 days, I'll go and I'm too loose. A druggist suggested I take stool softerners, I do this too; but, this doesn't seem to help either. I seemed to have the worst, slow digestive system. He said that maybe I've taken too many laxatives; but, I really don't. I'll gave myself close to a wk before I'll do take one, mean while I'll try to add fiber and lots of water to my diet everyday. I have a bad back too and cannot get as much excercise like I'd like and some of my meds are contributing to my constipation.