After finishing final treatment what Casportpony stated, and you still see blood; get 5 days supply of sulfadimethoxine from a vet and treat your hen(s) with it.
To treat coccidiosis I give them a little milk because chickens are lactose intolerant and it causes diarrhea which pushes out all the harmful bacteria and they get better in a few days. It only give them a little bit because it gives them no nutrients and they need water to still live