I'm in two minds about front line / advantage / stronghold
I've dapped Casper with an "old" vial of Frontline - initially worked, you could tell his back / tail area was much improved - now about 2-3 weeks in, still better than before dapping . . . but, not 100% clear - Frontline is available on-line and without prescription
Which leads us to Advantage - again, available on-line, without prescription. Dapped both Clive AND FiFi a day or so after Casper - they're still fine not even a hint of bites on back / tail area - well worth getting as the price on-line is affordable and it works
This still leave us Stronghold - this is, at our vets, marketed at the "gold standard" for flea treatment. Of course it is, it's prescription only, so I can buy a prescription for £15 which will enable me to get 6 months supply on line. There will still be a sizeable saving and I've got a couple of vials for WHEN Casper and / or Clive come in with an inaccessible tick, the one time I've used Stronghold it made removing the tick straightforward
So, you pays yer money and you takes yer choice - mine would be for usual dapping I'd get the cats Advantage - just make sure you get the right strength as there are 2 - one for <4kg cats / rabbits and one for >4kg cats / rabbits - and yes, that is correct same one for cats and rabbits