"Tylan-50 Injectable" is an antibiotic designed for intramuscular injection. IM injections are given in a large muscle; in chickens, this is the breast muscle. Take care to avoid the crop. Giving the injection in the neck can be ineffective, and potentially dangerous.
1/2cc of Tylan-50 is sufficient for mild to moderate infections. Tylan should be injected daily for 3-5 days. Like any antibiotic, finish the entire course of treatment- so a minimum of 3 injections. Stopping treatment early can promote antibiotic resistant bacteria.
quoted from an earlier thread...
DO NOT inject it into the breast muscle. You need to inject it under the skin of the breast, but not into the muscle. 3 days. switch sides each day.
I've also given it orally after reading posts on here where other BYC'ers have given it orally. I had the same results with oral as with the injections.
You CAN give it orally. It's seems just about as effective, maybe not quite as quick... and I'd give it for a minimum of 5 days.
Of course, it can be given IM injection, too... but DO keep in mind that it's meant to be injected into the muscle of a LARGE animal... it does cause some muscle damage, which can vary. The damage it may cause in a very large animal is insignificant due to the SIZE of the muscle/animal. There isn't as much muscle in a WHOLE chicken as there is in just a very small area on either of those other animals.
IF given in the muscle, don't go deep at all. AND, change injection site every time. The birds don't seem to react much when actually injected, but it does burn/sting very much, and I've had some act very, very tender at the injection site for a few days.
You can inject it sub-Q, too... and in the neck... but again, they can be sore. I had some that didn't want to move their neck, stood with their neck "in their shoulders" for a day starting the morning after the first injection sub-Q'd in the back of their neck...