Metformin is in general, a good medication. There are others in the class such as
Avandia. You can talk to your doctor about this. You might try drinking more water, eating more fiber (vegetables, whole grains), taking psyllium seed fiber and walking regularly. Each of those can help. Of course, there is always the laxative option but it's best to try the others first. Take it with meals, this helps. Onglyza is another alternative medication idea.