Poor wee Bud, i am hoping he'll have a quick recovery.
Hmm i have a lorikeet and they love anything sweet that disguizes tastes, so not too sure on how to get the meds into bud. Is he still drinking? maybe try putting some meds into a small amount of water?
but i'm afraid you may just have to force the meds into him, I had to do that to my lory and I know it's not nice having to do it.