Yes we do use Frontline in the states, the best one is Frontline Plus. There is also Advantix. Both work great on fleas and ticks. Being that this person lives in Fla, I'd recommend using one of them every month year round to make sure that the problem doesn't return.

They are available from the vet, although some pet stores and online pet supply places carry them. Where I live it's cheaper to buy them from the vet than other places, but I don't know that it's always that way in every city.