"i&#039;m rating this 5/10 because, well, it prevented pregnancy.  it was cheap and easy to use, i used it back to back to prevent periods, too.  i took it for about 8 months.  right away, i had trouble eating foods, especially in the morning.  even things i liked to eat, cereals, fruits, etc., i couldn&#039;t stomach.  by month 5 i had  chronic nausea, heartburn, indigestion, upset stomach.  there was hardly anything i could eat that wouldn&#039;t make me sick.  in the beginning of month 8 i was diagnosed with gallbladder disease.  i stopped taking portia and my symptoms disappeared within a week so i was able to cancel my surgery.   i&#039;ve been on various birth control continuously for over 7 years.  i have never had problems before. "