To the OP - if your kittens don't have fleas (run a "nit" comb under their armpits and chin if you're not sure) then you may as well continue with the Frontline at the recommended dose at least to use it up while you have it, it is a good product just I think down South with the mild winters we have monster fleas these days

sorry, just read ur post properly and i see that FL wasn't workin and ur BM solved the problem for now (amazing!) but yh I would recommend askin your vet about alternatives next time they're due a treatment xx