Nilstat is a particular anti-fungal drug made by a particualr company. The generic drug name is called nystatin, and many different companies sell it under different names.
I'm pretty sure you can buy this prescription drug just about anywhere, at any pharmacy even. You just either need a doctors prescription or you can buy online.
My doctor at the time told me that if the nilstat affected me within 2 weeks (if I either got sick or got better) then I had Candida.
Of all of the anti-fungals, nystatin is both effective and gentle on your body. Having said that, all drugs affect your liver negatively over time. However, I was grateful for that first year of use, because I was very messed up.