Hey dalia! Levsin (hyoscyamine) will relieve IBS, make you feel better, and control the D. Unfortunately, it doesn't come close to curing it. I'm going to my gastro tomorrow to see what else is available for IBS. The hyoscyamine has side effects. The eyesight problems have became a problem for me, I'm always blurry and (ha) floppy. I like that description. Fits. The drug can cause short term memory loss, which I definately have. I think the eyesight problem is the worst. I have trouble focusing sometimes. But, as bad as all that is, the D from IBS-and pain-is even worse. I'm tired all the time, too. Sigh. We need a cure. But, if the drug makes you feel better, that's good for now, eh? Sorry I couldn't be more help. If my doc comes up with something better, I'll post it.