I was prescribed Levsin for abdominal pain and cramps but I have IBS A and I was wondering if this will make my constipation more severe and if it is worth taking it. I do take a fiber supplement is that enough to cancel it out? As long as I take it as of now (w/o the Levsin) I usually manage to go everyday and not have it build up into a diarrhea episode although it sometimes happens anyways but not near as often as it used to before the fiber. I'd like the advise of people who have taken this or know something about it. Thanks.