birth control
"I was on Loestrin for around a year, and I needed to get off of it because it made me very depressed.  I was always moody and upset, and two of my friends told me that Loestrin made them feel like it too.  I've been off of it for about two months now, and I feel so much better.  Other than the depression, there weren't many bad side effects.  I just couldn't deal with the mood changes."