We picked up Corid at our local Grange. Ours came in a powder. I am guessing most feed stores should carry it. I keep Poultry Nutri-Drench on hand for any chicks or hens that are sick or week. Gives them fluids and vitamins at the same time. Have a Speckled Sussex that was stuck on a plane an extra day sick and weak when we picked her up. Didn't think she would make it but she pulled through after I gave her the PND for 2 days.
Liquids are important at this point. Maybe an eye dropper and just a tiny bit of fluids at a time. You don't want to give too much too quickly and asphyxiate it.
For feeding I found the easy way was to make a mash like wet oatmeal out of the feed and get a bit on my finger, pry the beak open with one hand and wipe the feed in the corner of the beak with the other hand.
This should take you to a dosage information:
https://www.backyardchickens.com/t/818879/updated-corid-and-amprol-amprolium-dosing
Liquids are important at this point. Maybe an eye dropper and just a tiny bit of fluids at a time. You don't want to give too much too quickly and asphyxiate it.
For feeding I found the easy way was to make a mash like wet oatmeal out of the feed and get a bit on my finger, pry the beak open with one hand and wipe the feed in the corner of the beak with the other hand.
This should take you to a dosage information:
https://www.backyardchickens.com/t/818879/updated-corid-and-amprol-amprolium-dosing
