I keep acidopholis capsules on hand all the time and start taking them anytime I'm on antibiotics for anything ... also give it to the dogs or horses anytime I have them on antibiotics as well. Puppies and foals, especially, are very sensitive to antibiotics and it doesn't take much to really screw up the gut flora and cause serious problems. They just don't have the body mass to deal with dehydration from diarrhea ... and I would imagine that rabbits, being even smaller, would react even more drastically to that.