In many cases it will be cheaper for you to get your vet to write a prescription and order your pet's medicine from Some vets do charge a prescription fee (usually between $10 and $20) so make sure you take this in to account in your calculations. Some pet owners feel uncomfortable asking their vet for a prescription, but you really shouldn't. Most vets are happy to write prescriptions and understand that as pet meds are expensive, pet owners need to save money when they can. Here's an easy guide on how to ask your vet for a prescription: