Informational booklet symptoms and conditions

For all of you that has had problems with Yasmin or Yaz, I'm sincerely sorry. I'm really curious though to all of you, has anyone that read the leaflet that comes with the birth control box, have any problems? If you read that it may increase potassium which may cause serious heart and health problems so it would be good to get your potassium level checked before taking it. Side effects usually go away after 2-3months, has anyone have problems longer than that and ended up finding out what was the problem? I just wanted to know because my girlfriend is about to take it...and I wanted to know if one knew about the effects of this pill, and what precautions they had taken. Okay, thank you.