I got halfway through a really lengthy explanation and realised that my question doesn't need it really.
Frontline doesn't seem to be working on our boys, and the vet thinks one of them has a flea allergy, so I did a Google search and people seem to recommend Advocate. I tried to buy it through a site, but it asked for prescription details
Do I need to go back to the vet for a prescription before I can get this for him? As they have seen him twice and given him injections which cleared it up, would they issue a prescription over the 'phone?
I would need to get it for both of them and the vet hasn't seen the other one (we adopted him 3 months ago) so would he need to see him? He (new cat) gets really nervous and had to be sedated to be brought to our house when he moved in, so this would be quite traumatic for him.