Alot depends on how your IBS is. If you have alot of normal days, with only an occasional problem you could probably just take as needed. And if you only have problems with known triggers, you could pop one prior to the trigger event (most things work better if you don't let it get bad before you take the med for it).OTOH, if you have mostly bad days, a regular regime may work out the best.K.------------------I have no financial, academic, or any other stake in any commercial product mentioned by me.And from the as if IBS isn't enough of a worry file...from New Scientist's Feedback column: photographed on the door of a ladies' loo in the Sequoia National Park in California by reader Liz Masterman: "Please keep door closed to discourage bears from entering."