birth control
"Ortho Cyclen made me so depressed I wanted to end it.  I started it when I was young, and it was my first pill.  Nobody told me how extreme the side effects can be, and I was on it for years, just thinking I was a horribly depressed person and that life wasn't worth living.  If I wasn't so close with my family I really think I would have put an end to myself.  Turns out they gave me the wrong prescription and had originally intended to give me Tri-Cyclen.  When they switched me over (after YEARS) the depression lifted.  I don't know how much it prevented pregnancy (I would imagine well) because it turns out I'm sterile anyway.  *sigh*  But it ruined my quality of life so badly I wish I could do it all over again. They don't warn us enough."