I have fought yeast for the last few years and tried just about everything. Don't buy acidophilus from walmart or any drug store. To get the good stuff you need to call your local health food store and ask for Multidophilus by Solaray. Solaray is the brand. This is kept in the refrigerator section. They are capsules. Take 2 three times a day until the burning subsides, then two am and two pm, then two a day, forever!!
I have tried many many brands of acidophilus and bifidofilus, but this is by far the highest quality I have found. Also, because it contains live strains, it must be refrigerated. Stuff off the shelf from grocery stores has already died, so it is pointless.