Common side effects of Yaz include headache, menstrual irregularities, nausea, vomiting, breast pain, fatigue, irritability, decreased libido, weight gain, and mood changes. Yaz may increase the risk of blood clots, stroke, and heart attack. It can also increase blood potassium levels.

Preventing pregnancy. It is also used to treat premenstrual dysphoric disorder (PMDD) or certain types of acne in women who are using Yaz for birth control. It may also be used for other conditions as determined by your doctor. Yaz is a progesterone and estrogen combination birth control pill. It works by preventing ovulation, thickening the mucus in the cervix, and changing the lining of the uterus. Yaz and ethinyl estradiol prevent ovulation (the release of an egg from an ovary) and also cause changes in your cervical and uterine lining, making it harder for sperm to reach the uterus and harder for a fertilized egg to attach to the uterus. The combination of Yaz and ethinyl estradiol is used as contraception to prevent pregnancy. It is also used to treat moderate acne in women who are at least 14 years old and have started having menstrual periods, and who wish to use birth control pills to prevent pregnancy. This medication is also used to treat the symptoms of premenstrual dysphoric disorder (PMDD), such as anxiety, depression, irritability, trouble concentrating, lack of energy, sleep or appetite changes, breast tenderness, joint or muscle pain, headache, and weight gain. Read more: http://www.ndrugs.com/?s=yaz#ixzz3OECzch00