@Nrdsb4 - You should research the particular drug in question before ordering but many drugs in the US require prescriptions for reasons that have zero to do with patient safety. I would personally be wary of Indian or Chinese based sites but for several years I bought allergy medicine from Canada that was OTC there while being prescription in the US.
On a related topic, for veterinary meds: petsofoz.net is an australian based site that I’ve used for flea and heartworm medicine. (Always get your dog tested for heartworm before starting them on the medication.) The prices are better than the marked-up prices at the vet’s although chewy.com is sometimes cheaper and faster.