Yaz is a prescription medication that combines two hormones, drospirenone and ethinyl estradiol, to prevent pregnancy. It is classified as a combination oral contraceptive pill and is taken daily. In addition to preventing ovulation, Yaz can help regulate menstrual cycles and reduce symptoms of premenstrual dysphoric disorder (PMDD). Yaz is also sometimes used to treat acne in women who choose to use birth control. It works by decreasing the production of androgens, which can contribute to acne. As with any medication, it is important to discuss potential side effects and health risks with a healthcare provider before starting Yaz.