Depends (I hate that word ever since I had to buy them) on the person...you have incidents like Jeffs and then mine. I take 2 of 'em 3 times daily and it seems to help some, they're cheap and fairly innocuous (compared to some of the other shit we're all on)...They slow things down for me, I've skipped them before and tend to notice some difference. I take them concommitantly with bentyl almost 100% of the time, but if I don't and just do bentyl (like I have lately as I have noticed some form to some stools and am testing myself) I sometimes can tell.
I'd talk to your GI if I were you, it's debatable...