Eprinex (Pour On) is an anti-parasite medication, effective against many worms (excluding tapeworm), most mites and some lice. Eprinex is not licensed for use in poultry in the UK but is sometimes prescribed by vets as they don't have Flubenvet in stock. Eprinex pour on is applied to the skin.
The preferred wormer for chickens is Flubenvet. It kills all worms, including tape worm. This is currently the only licensed in-feed wormer on the market.
As I write this (October 2012), Flubenvet has been out of stock for a couple of months and we have been inundated with comments, emails and posts in our forum from people trying to get hold of it. It sounds as if it is going to be out of stock for some time so are there any alternatives to Flubenvet that you can use?