Three questions: Will Ivermectin pour-on kill gapeworm and/or mites? How long will it take to see results? For most parasites, I should re-dose with Ivermectin in 10 days? (I've never used it before). If you want to read the whole long drawn-out story that brought me to these questions, you can read below: Our 2 year old hen has been sick for 6 days. Totally listless, does not like to open eyes, will not eat (occasionally will drink), shakes head, occasionally gapes and/or breathes through mouth. I thought she was dying and anemic from being covered in mites (which we did not discover until she became sick), but I wondered about gapeworm. Yesterday, she would not even drink, and I decide to treat with Ivermectin pour-on, as I read it would take care of mites, as well as gapeworm. We forced some fluids as well. About six hours after treatment, she had a resurgence and started eating and drinking on her own, even walking around looking alert, and then she crashed ( we bring her in the house in a cage at night). This morning, she will not eat again, and is gaping a lot. After a bunch of reading, I see I can test for gapeworm with a swab, which I would like to do when I have a helper here. I'm also getting a lot of conflicting information. One person says that Ivermectin does not kill mites or gapeworm, others say it does. I read fenbendazole kills gapeworm, but even if I confirm diagnosis, I shouldn't treat with 2 drugs on an almost dead hen, correct?