where do you live? Nystatin in the USA is prescription only. The dosage should really be 6 tablets per day, 2 tablets, 3x/day. I was on 3/day and it worked, but once I doubled the dose, I progressed much faster. My doc says you want to work your way up to the 6. You can even go as high as 8 million units which would be 16 per day. Dr. Stoll and Dr. Truss is where I got my info (search online and you will find their writings) – also my doc says he has some patients on 16/day, sometimes for two years. Dr. Stoll says you can take too little – so he recommends at least 3 million (6 tabs).
You can take them with or without food. it won’t interfere with the herbs you’re on as far as I know.