Fluconazole 150 mg capsules are an antifungal medication used to treat vaginal yeast-based infections caused by the yeast known as Candida. It works by stopping the growth of Candida. It usually starts to work within 1 day, but it may take 3 days for your symptoms to boost or more to 7 days for your symptoms to disappear.
When you have a yeast infection, it helps to learn that there is an efficient treatment in a convenient single dose.
Can You Buy Diflucan Over The Counter?

So you think you have an infection from yeast and you get an over-the-counter (OTC) treatment, but four days later you remain very itchy/irritated/burning constantly. OTC yeast medications are as effectual as fluconazole (Diflucan) and both will cure 85-90% of yeast-based infections.