each time its just a dribble of pee.
That statement makes me think it is medical plus the fact that it is escallateing. The meds he has been on all summer may not have been strong enough to work in his body... they could have even been expired when you got them.. Who knows? I would call and talk to the vet himself and just ask for a different, stronger antibotic and explaine to him that hubby says if it don't stop he has to go. He will understand that for sure!

I think it it was behavioral, he would be spraying a full stream.... BUT, let's say it is, could you crate him in a big cage or kennel, or confine him to a smaller area, one that is easy to clean? Or even just get some of that spray repellant for cats and spray everything with it.....?

You know what would happen to him if you rehomed him.... nobody wants a cat that pees everywhere, rehoming would upset him even more, don't you think?

Just throwing my thoughts in here... I have a problem with Amy not always going in the litter box here and we (Rie and I) have found that it is best to keep all throw rugs picked up and have only 3 litter boxes (for my 4 insted of the 5 to 6 I had) have helped a lot. I have also got a big box of those hospital disposable pads (like real large puppy pads) to put outside the litter boxes for those days she just can't make it in the boxes from falling over.