We went through this with Mittens, and we'll go through it again with Marcus. It means two shots per day, one at 7am (mostly administered by terri_osborne) and one at 7pm (mostly administered by me). It also means we have to board him every time we go away for any length of time, just like we did with Mittens.
We also have folks nearby who can help, which we didn't before, and bronxbob350 can also come over in a pinch.
I'm glad that, if something had to be wrong with him, it's something we can handle. I was especially a'feared of it being his thyroid, which would probably mean pills. I don't even want to think about having to give Marcus pills.... *shudder*