I tried petmeds.com one time and they wouldn't sell them to me without my vet's prescription......so I went to my vet and told him I needed him to write up a prescription and he tried telling me the drugs were from out of the country and not the same.....blah, blah, blah....so he didn't want to do it.....I figured it was because he would be losing his share of the money on selling the pet meds.