Metformin Hcl 500+ Voglibose 0.2mg is a combination of two antidiabetic medicines: Metformin lowers the production and absorption of sugar in your body and allows better use of existing insulin. Voglibose inhibits the intestinal enzymes that cause breakdown of complex sugars into simple sugars such as glucose. This prevents blood glucose from rising very high after meals.. Monitor your blood sugar level regularly while taking this medicine. Strictly follow the instruction given by doctor.