If you stop suddenly, then you would definitely go to the bathroom more quickly, perhaps even to the point of diarrhea, depending on your normal dosage, and how long you have been taking it. As the body gets more accustomed, you will be more likely to get the runs if you stop cold turkey. I suggest tapering down, unless you have been taking 5mg or less per day, which I doubt. Also, you may get irritable if you suddenly stop taking the vicodin. My advice is to take it slow if you really wish to quit the vicodin for bowel purposes.