Its not the only treatment by a long way, but it is probably the best.....It depends which aspect of PCOS is causing you trouble. The syndrome has been treated by oral contraceptives (quite effectively) but if you are trying to conceive (as one of the symptoms is reduced fertility) then this is obviously problematic. Metformin works by affecting the insulin levels in the blood, which commonly causes weight loss, though it is very rare for this to be troublesome. It also helps regulate the hormone balance of the body, so regulation of menstrual cycle is common.....
There are support groups and info on line...try
http://uc.edu/~gartsips/polycyst.htm
for
info on metformin.
and though I havent been treated myself (Im male...) my sister in law has...and she lost weight, and now has a daughter.