Hello! In July 2008 this message board helped me diagnose one of my chickens with gapeworm. I gave her the Panacur paste and she got better quite quickly. I still have that tube and it says it is good until August 2011. I recently had another chicken come down with gapeworm and I fed it some of the paste two weeks ago. Nothing. She has gotten worse and the last two days I gave her a dose both days. I have her secluded from the rest of the flock but I'm not really seeing improvement. I think I will buy another Panacur (fenbendazole) today because I'm wondering if the old one just is too old. How long should I wait to see if the medication is working? She seems a tad bit better but is still sticking her neck up and gasping, just not as bad. I'm feeding her raw eggs from another chicken since she can't get anything solid down anymore. I have spent an hour online trying to find out how long it takes before the worms die and the chicken gets better, but can't find anything. Also, how do they finally get rid of the worms once they are dead? I know they live in the lungs and crawl up the trachea. Do they cough them out, do they dissolve, or do they ingest them somehow? Thanks for any help.