I've used Tucoprim. It's good stuff. I never had any problem getting any of mine to eat it. I guess my sweetfeed had enough molasses in it to make it stick. You might try buying some cheap molasses at the grocery and mixing it with that. A couple of years ago, Tennessee came down with the heaves after I got a batch of dusty hay and I had to give him some kind of powdered antihistamine, I can't remember what it was called, but it must've tasted horrible coz he wouldn't touch it. The molasses worked for that, but I had to do like you said and mix it into a paste with the medicine and give it to him in a wormer syringe. The molasses made it stick to his tongue too.