I was switched to Rigevidon after 8 yrs on Microgynon, the doctor explained that this was a cheaper option for the NHS and that it was "the same thing", I gave it a good seven months thinking that the mood swings I had in the first months were just a settling in period, but they became a monthly thing, to the extent that people started commenting on it. I know they're theoretically the same thing, but my reaction suggest there's something different in there. On the plus side when I went to my doctor and explained this, she was happy to put me back on Microgynon. Frankly the number of posts on here that mention similar side effects should suggest that they need to do a proper review of this to find out why there's such a marked change for some of us between the two.