The Tylan 50 injectable dosage for chickens is 1/4 ml (0.25 ml) per pound given 2-3 times a day. I would give it orally by removing the needle from the syringe. A 3 ml syringe with an 18 or 20 gauge needle is used to withdraw the drug from the vial. Remove the needle, gently squeeze the chickens cheeks to open the beak, squirt in a few drops at a time.