Tylan 50 / 200 injectable is NO LONGER available in US.
An alternative option to consider: Manufacturer: Nita-Farm Tylan 50 / 200 (click here) Sourced from: Rus.Fedration.
Can be purchased on Ebay:
EBAY - TYLAN 50 Nita-Farm (click here)
EBAY - TYLAN 200 Nita-Farm (click here)
Smaller size...