Lucky is such a handsome boy.

As for the medication, yes, the vet put Jim and Sterling on Amitriptyline (calling it a kitty prozac). It is suppose to help reduce the stress that causes them to think they need to spray mark. As I told Lisa, I do not know if it is working 100%, but I do know that is DOES work. (because if they spit out a dose, or if I try to reduce the dosage, they definitely start to get caught spraying again).
But I know there are other choices, because my vet even mentioned an alternative if this did not seem to work. (can't recall the name, though)