Why would you inject tylan 50 into a chicken? Your crazy if you do. Tylan 50 is for cattle.
Oxytet 343 as I stated above for what you might think is a common cold.
Vaccines? The best vaccine for any bird is good genetics / strong bloodlines, clean and dry coops with good ventilation.
I drive quite a bit, I see many coops with a 5x5 run out area, where there are twenty chickens in the pen. That doesn't work either. Free Range, if you have limited space, move the coop to drier ground..
Like I said, its a waste of time. Injecting a chicken is a last resort and the only medication i would inject is Penicillin in a severe case of infection due to a cut, puncture wound or a bird that was attacked or a bird you cannot afford to lose..
Let chickens be chickens. Good strong Genetics and bloodlines goes a long way into growing a strong immune system.
Injecting a chicken is not the answer..