Here's what my doctor recommended and it worked fast for my yeast infection cure (I rarely get yeast infections since curing them this way)

Hydrogen Peroxide mixed with water. I can't remember the exact ratio she(my doctor) recommended, but it was about 1/4 of the syringe filled with Hydrogen Peroxide and then the rest with water. Insert slowly with one of those syringes used to measure liquid medicine. Do this daily until symptoms go away. I am not a doctor so research this method before trying.

The reason Hydrogen Peroxide works is that your vagina naturally produces it to keep itself infection free.