"i was switched to kariva because it was a generic version of the current birth control i was on. i do not recommend it. i would have my period normal one month and then i would get it again 2 weeks later. the second period would last for 2 weeks. it was great for controlling acne and i only gained 3 pounds being on it. it seemed to keep my mood swings down. the bad thing with it is i stopped taking it 2 months ago and i have not had a period since. i did a pregnancy test with my doctor and they verified that i was not pregnant. down side of this is i went back to my regular birth control and i cannot start taking it until my period starts again."