FDA Consumer Health Information
Oct. 11, 2017

If you’re purchasing medications for your pet online to save money or for convenience, there are Internet sites that represent legitimate pharmacies.
But the U.S. Food and Drug Administration has found that there are others that sell unapproved pet drugs and counterfeit pet products, make fraudulent claims, dispense prescription drugs without requiring a prescription, and sell expired drugs. Any of these practices could mean that the products you are buying could be unsafe or ineffective for your pet.

Keep reading: https://www.fda.gov/forconsumers/con.../ucm048164.htm