There are only 3 kinds of Tylan--Tylan 50 and Tylan 200 which are injectable, but also used orally, and powder which is only used orally, mixed in water. The dose is usually about 1/2 to1 ml or more, depending on the size of chicken. Tylan 50 contains 50mg per 1 ml. 10 mg per pound is a good way to remember the dose. A 5 lb chicken would get 1 ml. A 7 lb chicken would get 1.4 ml.