"i have been taking yaz for about 10 years, a few years ago i was given loryna as a generic for yaz and didn&#039;t think anything of it assuming it should be the same. while taking the generic i experienced extremely heavy periods that would last at least a week with a lot of blood clots. typically my period is extremely light/no blood clots and lasts 3 days. i became very emotional and had drastic mood swings. eventually my heavy period came and then didn&#039;t leave for an entire month, this made me realize the only thing that had changed was switching to generic yaz. once i switched back to yaz all these symptoms stopped. i only get yaz now."