AVC is used to treat vaginal yeast infections; it is a type of antibacterial medication that is used to fight bacteria in the body. AVC works by halting the growth of fungus, which is the leading cause of vaginal yeast infection. The patient should use AVC in full amount as prescribed by a physician or as documented in the package of the drug. This means that AVC should be taken to complete dosage even if the patient starts to feel better. It is also not advised to use AVC if the patient has experienced any allergic reactions from it or any other sulfa medication employed in the past.