If your pet takes medication on a regular basis, you should check out 1-800-PetMeds. They carry every type of pet medication, and they are usually half the price of what you'd pay at your vet. To use them, you just get a copy of the prescription from your vet and FAX it to them. You can then get your pet medications by calling them or using their website. We use them for heartworm pills, and it's a big savings.

They even carry medicine for bigger animals too, like horses.