birth control
"It was convenient having the diminished periods.  However, when I was on this pill it put me into a horrible major depression.  I had never before experienced any mental trauma or illness, and as soon as I realized that it might have been this birth control and took myself off of it I was basically back to normal in about two weeks.  It affects everyone differently, but I also had found out that  friend of mine was on this pill and she, too was uncharacteristically depressed. "