Earlier my mom is used to take galvus met 50/500 mg tab twice a day, but this time doctor has suggested her to take galvus met20/500 mg. I asked the reason why he is changing the medicine power but I didn't get any suitable reply and also this medicine is very difficult to get. Can you suggest me the most probable reason for it? please As my mother is 55 years old suffering from diabetes since last 30 years.