"i was on trinessa when i was 18 for about a year, and it worked fine for me. i then discontinued use of any form of birth control for for several years, but at 24, i decided to get back on the pill. i figured i would go back to trinessa since it worked well before. i&#039;ve had a history of irritable bowel syndrome ever since i was a child, and finally got it under control at around age 21. the first time i was on this pill at 18, it didn&#039;t affect my bowel habits. but something must have changed with the pill or with my body, because from the day i got on this pill last month, i&#039;ve been having irritable bowel flare-ups daily, literally unable to leave the bathroom for an hour."