In 24 hours, the product has effect on my two young cats (3 months + 1.5kg). No chips apparent whereas before we saw them frolicking happily. These are cats that I recently received, they are moderately infected, and my house is not infected (no time). The product to their cause itching strong the first day (it's the first time I bought it).
I their re-administerais the next two months to be sure to get rid of it.
I strongly advice the product (but watch your cat the first day, in case he would have a reaction other than itching, it can be allergic to the product).