Flubenvet 1% Medicated Premixture is a domestic poultry wormer powder and is effective against tapeworm, large roundworm, caecal worm, hairworm, and gizzard worm in chickens, turkeys, and geese. Activity includes adult worms, larvae and eggs.

Dosage & Administration
Medicated feed should be fed for 7 consecutive days. Incorporate the required aount of the product into the daily feed ration to ensure that flubendazole is include at the following rates:
For Chicken and geese the ration must contain 30ppm
(6g of product in 2kg of feed)
For turkeys the ration must contain 20ppm
(6g of product in 3kg of feed)

Withdrawal Period 
Birds must not be slaughtered for human consumption during treatment Treated birds may be slaughtered for human consumption only after 7 days from the last treatment. 
Chickens, turkeys, geese: Meat 7 dats
There is no withholing period for chickens producing eggs for human consumption when the product is used at the recommended inclusion rates.
Chicken eggs: zero days

Contraindictions, Warnings etc
May cause sensitisation by skin contact.
|May cause skin and eye irritation
Avoid direct skin contact. 

Please see below link to the Veterinary Medicines Product Information Database
http://www.vmd.defra.gov.uk/productinformationdatabase/Default.aspx