Metformin
polycystic ovary syndrome
"I was diagnosed with polycystic ovarian syndrome when I was 16 Y/O and very irregular periods and some body hair.
I was becoming increasingly unhappy with how things were and so the doctor tried to help by putting me on the pill. This helped only by regulating my 'period' every month instead of having a random period twice a month or nothing for 4 - 6 months. 
I'm 28 now and I've literally been on Yasmin since I was 17 to 27 y/o with no breaks. My hubby and I are trying to conceive so I came off the pill in March 2014 and from then till Nov 2014 I had one natural period. 
So, the doctor prescribed Metformin in November, I take only 500mg twice a day and on Dec 24th 2014 I had my period. Then again now Jan 30th 2015. The only down fall is very sore cramps."