How much does your chicken weigh roughly? What are you looking to treat? The dosage of Tylan and LA 200 are totally different since one is tylosin and the other is oxytetracycline. Most adult chickens can have 100 mg a day of oxytetracycline, and that would be 1/2 ml or 0.5 ml of the LA 200 daily. I would give half in the morning (1/4 ml or 0.25 ml ) and half in the evening just to make sure there is a constant drug level in the blood. Give it for 7 days. You can sometimes find the Tylan or tylosin powder at jedds.com for pigeons to give orally in the water for 5 days.