I have read that there is no egg withdrawal period for Eprinex yet I found this; Ivermectin - Used for Worms, Lice and Mites in Chickens Written by Ben Rolfe Wednesday, 24 June 2009 19:02 Ivermectin is an anti-parasite medication, effective against most worms (not tapeworm), mites and some lice including scaly leg mite and northern fowl mite. Ivermectin pour-on / drops is applied to the skin. PHARMAQ Ivermectin Drops are sold under the Small Animal Exemption Scheme for use in rabbits, Guinea Pigs and ornamental birds. Products licensed under the Small Animal Exemption Scheme are not licensed for use in food producing animals such as chickens and it is for that reason that there is no information relating to the withdrawal period for eggs or meat following use of Ivermectin Drops on poultry.Where there is a licenced alternative, vets should be prescribing the licenced product. To treat worms - Flubenvet is the (only) licenced in feed product. In the absence of licensed alternatives, veterinarians do sometimes prescribe this product for poultry under their own clinical judgement to treat mites, lice and worms in poultry. However, it is only a veterinarian who can advise on such use and it would breach of the veterinary medicines regulations and NOAH code of practice by supporting, or encouraging the use of this product on a non-target species. It is for this reason that we are not recommending you use Ivermectin for this purpose unless it is prescribed by your Vet. Sometimes prescribed by Vets to treat Ectoparasites: Worms, some lice and most mites including scaly leg mite. Remember Red Mite live in the house, so housing will require alternative treatment. Formats available: Injectable, oral or pour on drops for skin. Pour on drops are usually prescribed by vets in the UK. Dosage: Follow the instructions given by your vet, there are various strengths and dosages and it depends on the strength of the preparation that you are using. For the treatment of an existing infestation, repeat doses are required often weekly three times. Active Ingredient: Ivermectin Sold in UK as Ivomec, Xeno 200, Noromectin but also has names like Heartgard30 and Acarexx Egg Withdrawal period: As advised by Vet, depends on the strength of solution. Vets prescribing Ivomec Eprinex usually advise 7 days. Slaughtering for meat for human consumption: As advised by Vet, depends on the strength of solution. Vets Prescribing Ivomec Eprinex usually advise 28 days. Wash hands thoroughly with soap and water following treatment Category: POM-VPS Storage: In original packing below 25ºC and out of reach of children. The information given here is the opinion of the authors and should not be considered as professional advice. Where there is conflicting information, you should always follow the advice of your vet. This this a different medication?