Hi as the title says really- I have 2 cats, one long haired, both rescue cats, horribly difficult to administer any flea treatment as were semi feral. This year has been a tough one flea wise, we've tried everything- Advantage worked for a while but seems to have stopped being effective. Tried Frontline last month which I hadn't used in years, useless. Using Acclaim spray for the house. My long haired cat seems to still have live adult fleas on her, itching like mad. I'm going to make a vets appointment but wondered if anyone had had experience of the injection before I go ahead. Thanks.