Medroxyprogesterone
"Depo Provera was the first hormone birth control I used.  I only got it once.  Pros:  no pregnancy; no weight gain; no period; didn't have to worry about taking a pill everyday.

Cons:  was in tears for basically 3 months straight; sharp decline in sex drive; increased acne (probably from crying all the time); bleeding for 4 weeks straight when I got off it."