A friend who fosters cats and works closely w. local shelters, recommended cheristin for cats. I ordered 6 pk from Petvm, for $67. Expected in 5 days. Will update results here.
Cheristen contains Spinetoram which is one of many pesticides that will kill fleas. But, it does not contain an IGR - insect growth regulator - which is what is needed to kill flea eggs/larvae. Pyriproxyfen or Methoprene are both considered IGRs. Cheristen is a once a motnth topical treatment that enters through the sebaceous glands rather than the blood stream.My cats are weight at least 12 pounds and more. When I looked up cheristin it said it lasts for 6 weeks but then it also said to apply every 30 days. i read in order to kill fleas treatments need to contain pyriproxyfen or methoprene…it looked like cheristin didnt have either of them listed….i could be wrong and I hope it works for you, please let us know.