Our Crew here at CCs is maintained on a monthly basis using these two products. When I release my pups I let my families know that these product are a good idea. With the warmer winters we have been having in the midwest we are finding an upswing in canine parasites. I have been using these products and have had no problems at all.
You must purchase this through your vet. It has come to my attention that there are knock off look a likes out on the internet and can be harmful.