I agree with what the others have said about trial and error. I have had good results from Femodene and Qlaira but had a horrible time with Marvelon - the pill so many of my 40-something friends take happily (including my GP!). I did have initial side effects with all the pills I have taken, but Marvelon was the only one that I really couldnt tolerate. I just 'knew' it wasnt for me after only three weeks! After three months on all the others, I have felt as near to normal as possible. Unless a pill is simply intolerable, I really think you need to give it several months before you make a decision. It needs time to settle.