Last year when when our dogs had extreme fleas, I was using Advantix. It did not do the job. My vet told me to use Advantage, not Advantix. I did not even ask for details about why, but the ticks were not my big problem right then, so I switched, and the results were better.

I bought Advantage from Petshed.com. It is an Austalian company. I called the customer service hotline number on the Advantage box and she told me this: If it has an EPA number on the tube, it is legitimate. This does have the EPA number on the tube.

Also, it works on the fleas.