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Hello,Thank you for using Just Answer. My name is***** am a veterinarian and will do my best to help.
I am sorry to hear about Mani. How long ago was the flea product applied? Was it a spray?
I would bathe him, to remove as much of the Happy Jack as possible.
Happy Jack contains pyrethrins and permithrins, which can cause tremors or even seizures in cats. If the tremors are bad, there is a medication your veterinarian can give, called methocarbomol, that will help until the insecticide wears off.
I hope you were able to see my responses; I have not heard back from you! How is Mani doing?