"i&#039;m 23 and have been on yaz for 3 years. i switched to yaz from ortho tri-cyclen lo because ortho was causing me major mood swings. yaz took care of the mood swings, i have virtually none on yaz, but it came with other side effects. the worst of them is debilitating intense headaches 2-3 days before my period. when i start taking the placebo pills, i get blinding headaches! also, decreased sex drive, and tiredness. yaz, did however give me very regular periods... they are like clockwork... i know down to the hour when i&#039;m going to get my period and it only lasts 4 days, and is light because of the headaches, i am switching to loestrin 24 fe. i hope it gets rid of the headaches and some of the other side effects. good luck!"