Kris, I was under the impression that two antibiotics are usually given for ulcers. Can you either email me or put on list what (in general) your vet likes to use for the antibiotic protocol for ulcers. I didn't know metronidazole had issues with ferrets, although I did know less and less vets are using it. Thank you for the information. Laryssa [Posted in FML 6316]