How and why does AZO Yeast work to relieve symptoms of yeast infections?

Also, if I take it enough will it get rid of my yeast infection. I bought Monistat because I know that I must do SOMETHING to get rid of it but the last time I used Monistat it burned and itched beyond belief, it was so much worse than the actual infection itself that I'm almost scared to use it again. Another reason being that my job requires me to be on my feet for 9 1/2 hours a day. I manage a clothing store and guess what, we are changing the entire floor set tomorrow meaning I'm going to have my work cut out for me and I cant stay home. The AZO Yeast pills seem to be somewhat helping.... any suggestions?? If I'm not mistaken yeast infections will not go away on their own... right?? My main question is why does AZO Yeast pills actually work in the first place??