We got the Tylan 50 from Tractor Supply and used a 22 guage I believe. Your local feed store or whoever you buy from should be able to help. It is a thick medicine. We used a spot under his wing. We pinched a little piece of the skin and just when under the skin. Give it to him real slow...
We had an extreme case last week in both eyes. Our guys eyes where swollen shut. His comb and color was a little off but he acted completely normal. We had to hand feed him and give him water 3 times a day (he was unable to see his food). We quarantined and we tried tetracycline for 4 days...