It is the once a month version of CapStar. CapStar is a very fast acting pill but only lasts 24 hours. The Comfortis is a pill the dog takes once month. I am not sure what is in it, but your vet would know. You have to buy it from a vet. This stuff works!!! I have never seen any ill side effects.
__________________ Tracye - Onni's, Bonnie Blue, and Bella's MoM 
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