I use one teaspoon of copper sulfate and mix it with a product called “Red Cell”. Note “Red Cell” is a liquid used for horses. I mix the copper sulfate with about 20 cc of Red Cell and give it as a drench. You can do this several days in a row if necessary.
Here’s a link to good article you might want to read:
http://goatbeat.net/index.php?topic=2384.25;wap2
Worming your Goat, some great tips