Glycomet, known traditionally by its generic name metformin, is a medication frequently used in PCOS. This is a medication that is also used as first-line therapy for type 2 diabetes. It is NOT a weight loss medication and will not decrease your insulin levels. It is considered by me (and nearly all Endocrinology Specialists) as a "weight neutral medication". In this, it causes neither weight gain nor significant weight loss.
The main mechanism by which this medication works is to reduce to amount of glucose (sugar) storage in the liver and to reduce the release of glucose. It reduces a process called gluconeogenesis, which is "new" "glucose" "making".
Our bodies are designed to store energy / glucose in the liver. This is stored as something called glycogen. When we are fasting (often while sleeping overnight) we release / make glucose to give us energy. We need this energy to maintain our breathing, temperature, dreaming / brain function.
Metformin, in a sense, dials this down.
For those with PCOS, the mainstay is to focus treatment at symptoms. Some people suffer from excess androgen (male hormone testosterone or its derivatives). Some people suffer from abnormal menstrual cycle.
The goal for a medical doctor like me is alleviate those symptoms. For abnormal menstrual cycle we use oral contraceptives (or IUD). For excess male hormone we can use an androgen blocker like spironolactone.
PCOS does not CAUSE weight gain but is made worse by excess adipse (fat) tissue. Hence, we should direct treatment to weight loss. This often can normalize periods and alleviate the insulin resistance and excess male hormone. This may mean meeting with a Registered Dietitian (RD). This may mean doing a Food Journal and documenting calories. Or, this may mean all of the above with medications directed at weight loss.
Hope this helps provide some insight. We doctors are not always good about giving realistic expectations.
Best of luck to you!