"i used have been on birth control for four years now- 2 years on yaz and 2 years on gianvi. both pills work really well for me. my sex drive wasn&#039;t affected, i haven&#039;t had a zit in years, and my periods are light and regular. however, my breasts got a lot bigger over the 4 years (great for my boyfriend, not so much for me) and i have gained weight. it also has made it harder to lose weight. i went off the pill for about three months in the first year of using the pill to see if i wanted to stay on it and i lost a lot of weight right away but everything else was irregular. however, i haven&#039;t been pregnant once and that is the main reason i take the pill, so it&#039;s been a good and reliable method for me."