I buy them all the time, typically "Thomas Labs" produces them. They also produce the same medicines for the pharmacy. Made here in Az. I usually get "fishflex" to take care of the occasional sinus infection, but they carry most everything. I buy them online, some times through Amazon, some through other stores. You have to realize though, fish grade antibiotics aren't top quality (as some sites say) because they don't care if they accidentally kill a few fish because of un-pure products. Anything Thomas Labs is typically pretty good.