A five pound hen would get ~1/2 teaspoon twice a day.
For anyone that decides to use the Medistatin nystatin, when using the measuring spoon that it comes with, one level spoon = 3 grams.
Each gram = 400,000 IU, so one level spoon = 12,000,000 IU. The dose I use is 300,000 IU per kilogram, so one level spoon will treat 8-kilograms (17.6 pounds).
Plumb's Veterinary Drug Handbook


From Willow Brook Pharmaceutical Index (picture from @Jantu345)
For anyone that decides to use the Medistatin nystatin, when using the measuring spoon that it comes with, one level spoon = 3 grams.
Each gram = 400,000 IU, so one level spoon = 12,000,000 IU. The dose I use is 300,000 IU per kilogram, so one level spoon will treat 8-kilograms (17.6 pounds).
Plumb's Veterinary Drug Handbook
From Willow Brook Pharmaceutical Index (picture from @Jantu345)
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