Wow...How do you know for certain its Sacchoromyces Boulardii?? Its very rare to have that strain as a problem. I had a CDSA (Comprehensive Stool Test) and the results came back with same yeast you mentioned. But My doctor said its probably still Candida since Stool test doesnt always pick up the actual Candida. And the results picked up S. Boulardi since that is part of your normal micro flora.
So I am going with the theory thats its still Candida.
Everyone is different but I didnt get great results with Nystatin, I was talking 2.5mil units per day for 5 weeks.
I get better results with a SF722, GSE, Oregano Oil. And I use varying amounts so it becomes more effective.
Also if you havent already you have to work on strengthening your immune system with good Supplements, The strongest Anti Fungal wont work if you have a poor immune system and poor Lymphatic System (the removal of dead yeast cells fast enough in the body)