Be careful on those aquarium pills, some also contain (don't remember what) a deadly poison. Same sorta thing with injectable antibiotics from Tractor Supply. If it contains streptomycin which is a good antibiotic. Drawback is streptomycin can make you deaf as a post.Extra prescriptions are a little difficult. Talk to your Dr. He or she may be a prepper. Fish antibiotics are the same that humans take. California vet supply has a good selection.