Ethinyl estradiol / norethindrone
"I have been taking this for a year. I switched from another birth control pill, which I was on for 10 years. Since the switch my period has been non-existent. I have always been regular, but not with this pill. At first I was very nervous each month, even taking pregnancy tests. Other than the irregularity this pill has very little side effects. It has helped with mood swings I was having on my old pill. I have not gained weight, and my skin seems clearer. I saw my gyno today, and she said the Lo Loestrin Fe has the smallest amount of estrogen, so it makes the uterus so thin, it just doesn't bleed. She says it is perfectly healthy and normal, So I am ok with that. I just know the week I go on vacation, I will get a period!"