I have read there is no withdrawal period for this antibiotic on this forum, however that is not what the package insert for swine says. As a pharmaceutical rep, I am curious as to why some members feel there is no withdrawal period in egg laying hens. Anyone who can share data that runs contrary to the data supplied to the FDA supplied information would be much appreciated. I administered this to my flock today and would hate to take an unnecessary risk with egg consumption for my family. I also found that using one gallon of water with two tablespoons of Dengaurd for treatment of symptoms was ideal with 1/3 to 1/2 cup of honey mixed in. It made it palatable for the hens to drink. Here is the package insert information: A withdrawal period of 7 days has been assigned for the 10.5 mg/lb dose of the DENAGARD (tiamulin) liquid concentrate formulation, based on the results of a residue depletion study done with the liquid concentrate at that dose. This withdrawal time is the same as is approved for the 10.5 mg/lb dose of the DENAGARD (tiamulin) soluble powder formulation. The fact that the two formulations have the same withdrawal time at the 10.5 mg/lb dose indicates that the depletion characteristics of the two formulations are essentially the same. There is no reason to believe that this would not also be true at the 3.5 mg/lb dose. Therefore, the 3-day withdrawal time assigned for the 3.5 mg/lb dose of the soluble powder has also been assigned to the 3.5 mg/lb dose of the liquid concentrate.