Try making a little bowl of warm porridge (as in an egg cup full) and put the baytril in there? if you put a little bit of sugar on it he should have no problem wanting to eat it :P just mix it in and put it in his cage or something. It;s not really a food he can store so it should be ok :P
probably just to clear up the snuffles that he has, or that he doesn't have anything major. Go with the baytril anyways, should clear up the snuffles, then try the steam baths if it comes back.
Yeah i know but it'll be worth it i complain loads about travel time but once i have those ratties and they're mine and home it;s all totally worht it ^_^