Birth Control
"I definitely recommend Mirena.  I have used it for 5 years, and just got my old one taken out, and the new one in.  My period was nonexistent within the first 3 months, after some initial irregular spotting.  I have used birth control pills and the Depo shot in the past, and I had tons of side effects from both, so Mirena is a welcome change.  The only downside for me was a couple of ovarian cysts within the first year, which have not come back.  The insertion was extremely painful for me both times, with severe cramping for hours afterwards, but totally worth it."