We should distinguish using Pepto Bismol for pouchitis, or slowing down stool or controlling butt burn- all of which would require somewhat frequent or regular use- and using Pepto Bismol for the irregular very upset stomach, Intense explosive diarrhea or nausea from bad meals, really fatty food, food poisoning, or some other cause. For the latter conditions there is nothing better in the world as a remedy than Pepto Bismol.
When I suffered frequent pouchitis flare ups in my pre-Remicade days, I used PB judiciously and never took more than the maximum recommended dosage. Generally, I would use it between antibiotic dosages during a flare and it definitely helped to calm things down. Then I wouldn't need it again for another month or two when the next flare occurred. But using it regularly beyond what I have described above is definitely not recommended.