Metformin, marketed under the trade name Glucophage among others, is the first-line medication for the treatment of type 2 diabetes, particularly in people who are overweight. It is also used in the treatment of polycystic ovary syndrome. It is not associated with weight gain. It is taken by mouth. 
Dosage: The dosage of this medicine depends on the prescription and instruction given by your doctor.
Precautions: Do not take this medicine without any medical consultation with your doctor.