birth control
"I started taking this when I was 17 years old (now almost 22) and ordinary antibiotics weren't helping my acne problems. Before, I had unpredictable periods (often skipping once every several months for no reason), painful cramps, and a period lasting up to 7 whole days. Now I have a 99% clear face, a regular light-medium period lasting 4-5 days and NO cramps! I am not sexually active (never have been), so I'm not sure how effective it is for me actual birth control-wise, but my sex drive is much lower. I may end up finding a new brand once I get married later this year because of this side effect alone."