I use the cattle strength, so adjust accordingly. I use an eyedropper. For large fowl, I put 7 to 10 drops on the bare skin above and below the vent and over the pin bones. The amount depends on size and whether they are infested or not. There is a high tolerance for this product. It has been used to treat humans for eye worm in third world countries according to reports I have read. For bantams, 4 or 5 drops should be enough. Some drop it into the mouth of the bird. There is no need for that, as it is absorbed into the system through the skin.