Eprinex is a great wormer to use because it has to absorb through the skin, making the action slower and less likely to cause toxic overload. I am glad to get confirmation from Dawg that is will get gapeworm too (I looked all over the net for this info last year to no avail). The 1st treatment I...
I, too, suggest gapeworm may be your culprit. You should give a smaller initial dose to your hen (my vet recommended 25% 1st week, 50% next week, then full dose 3rd week). This is because the dying worms could clog up/overwhelm your bird, especially if she is weakend already. Look for...