Don't give them to your pusscats then & douse yourself.
Seriously , I use Frontline every six weeks for both my cats to stop any flea cycle. It's the larvae that needs killing off as well as the fleas. Otherwise it perpetuates and can even cause infestation in carpets.
I'm in New Zealand & previously in the UK. All my cats have been outdoor as well as indoor cats so it has paid off to treat them regularly. Especially for the one that had the allergy to this.
My Tyler expects his ear tests to be on the bed. His shots to be on the settee and his food in the kitchen, although he will accept late snacks on the landing of a night.
Who rules the house?