In the United States, is a prescription-only medication and cannot be legally purchased over-the-counter. To buy it, you must have a valid prescription from a licensed veterinarian, which you can then fill through your vet's office or authorized online pharmacies. Authorized Retailers (Prescription Required)
Most major pet suppliers carry Bravecto, but they will contact your veterinarian to verify your prescription before shipping. Bravecto Flea & Tick Treatment for Dogs & Cats - Petco