Here you go....
http://poultrykeeper.com/poultry-medication/poultry-medication/frontline-for-lice-and-mites.html
dosage... http://chat.allotment.org.uk/index.php?topic=41770.0
http://chat.allotment.org.uk/index.php?topic=5250.0
ETA - And WELCOME to BYC.