Before you use any of these products, you need to know for sure that you have a yeast infection, not a different condition. See your doctor if you're not sure, because using the wrong medicine can make an infection harder to diagnose. Always follow the package directions exactly. Pay special attention to how often to use the product and how much to use. You need to get those two things right, because the dose targets the growth cycle of the yeast. Complete the whole treatment, even if you feel better. Antifungal medications can affect some drugs. Talk to your doctor or pharmacist before taking an antifungal if you are taking other medications. No matter which yeast infection treatment you try, see your doctor if your symptoms don't clear up after you finish treatment.