Medroxyprogesterone
"It does what it's supposed to, at least for me it did. 

I'm prescribed to take 10 days of 100mg Provera every night before bed every 60 days (or every two months I don't have a cycle). It makes me feel awful though. The first month I was prescribed Provera I took all 10 pills. I'm on the smaller side and I really think 100mg is just too much for my body. I have horrific constipation & gas after about 2 days on it, absolutely zero energy, and my face tends to breakout (only 1-2 small, it's always clear otherwise), it also makes me starving 24/7.  It works though."