I have found out that the pyrantel the vet prescribes is available at any drug store. It is marketed as Reese's Pin-worm Medicine. I checked with the Vet, and the concentration is exactly the same as what they prescribed. The correct dose is 0.7cc for a medium-sized hen. What I cannot find out is the egg withdrawal time. Does anybody know this? I would also like to know the meat withdrawal time, just for GP. Thanks !