So, what do you use if Frontline stops working?

[RightUpMyRue]

The past two times I've used Frontline, exactly as per the instructions, it hasn't worked, you can still see fleas and flea dirt in the cats.

What do I do now?

Stronghold. frontline doesn't work for us either, and Advantage leaves one of mine foaming at the mouth

Stronghold - our old cat was a right fleabag and Frontline never sorted her. Changed to Stronghold and we've never had a flea since

Excellent, two recommendations for stronghold. I've never heard of it but I'll buy some immediately.

Thank you.

You have to buy it from the vet btw. Handily it does earmites too (which fleabag cat was also prone to)

Yes, just realised this after some googling. Annoying I have to get a prescription but reassuring that it must be strong stuff so will kill the little buggers.

Advocate is good too, but also only on prescription.

we use advocate too