"my dermatologist put me on this to regulate my acne and i am currently on my third cycle using trinessa. i had been on birth control for the same reason almost 2 years ago but i had a 15 lb weight gain in under 4 months which is crazy since i&#039;m a runner. she told me these pills would not make me gain weight yet i&#039;ve gone up around 7 lbs and noticed that my boobs have grown a lot. the only other side effect i have noticed is dizziness and headaches. but as for its effectiveness: my period is very regular and light and my face has completely cleared, i still get a few breakouts right before my period but it&#039;s usually not bad at all."