Insulinoma ITSELF is a cause of diarrhea (in which case it often looks like unset butterscotch pudding --sorry but that is the most accurate description and it would have to be my favorite pudding, wouldn't it?). Check her blood glucose level. If it is still low that could be the cause -- low enough to cause runs but not low enough for more marked symptoms. I can't off-hand recall loose stools as a possible negative side effect for either but your vet could look them up, or you could ask your pharmacy to let you read side effects in their texts if you don't have refs. [Posted in FML issue 4430]