I was on it for migraines and neuropathic nerve pain years ago and I have to say it worked wonders. But after a few months on it I felt always felt groggy and started gaining too much weight . My mouth was always dry, something I hated and all my food tasted like metal so my doc took me off, he didn't like the side effects. They have a lot of newer drugs easier on the system now. Have you tried a simple benzo for your IBS? I know quite a few people that take them and they find it really helps.