Many feed stores sell it in the cattle medicines. You need to get 3 ml syringes and needles (18 or 20 gauge.) Draw up the medicine, then remove the needle to give it orally. You can give it by injection, but orally works well. Dosage is 0.25 ml (1/4) per pound 3 times a day for 3-5 days. Tylan treats mycoplasma (MG,) but won’t treat viruses. Call ahead to make sure they sell it.
