I am using Nitenpyram which has the same ingredients as Capstar on my cat. It controls the fleas on my cat better than Advantage or Frontline but one thing I don't understand about it. After giving my cat the Nitenpyram he seems to be tormented by the fleas for up to an hour and then he is contented. My question does anyone know what behavior of the fleas is causing this torment? Are they biting in desperation or just running around causing this behavior?
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