Hi, I am new to this forum but have read posts for several years. My question is on Corid. My vet had me give it to my hens for 21 days. She then said to lay off for 21 days. I called the manufacturer and they said there were no field studies on hens with Corid so they could not give me any withdrawal recommendations. In some of the posts here I have seen that there is no withdrawal at all. So my question is, where does everyone get their information? Has anyone seen any adverse effects eating the eggs soon after you've completed the drug?