I've been using Yaz for about three months now, and towards the middle of the first month was when I began to experience a few mild side affects. I became irritable and emotional, and so far I've gained about 5 pounds, but I learned to control it by month two. Now I'm at the end of month three, and new symptoms have emerged. If I'm hungry, I feel nauseated and lethargic. When I eat, the nausea becomes worse, and I actually ended up vomiting recently because I felt so sick. I've been bleeding every day, and have had difficulty becoming aroused even when sexually excited. I definitely do NOT recommend this medication. As soon as possible, I plan on seeing a doctor and switching to a better one!