The name "Metformin" is the BAN, USAN, and INN for this medication, and is sold under several trade names. Common brand names include Glucophage, Riomet, Fortamet, and Glumetza in the US. In other areas of the world, there is also Obimet, Gluformin, Dianben, Diabex, Diaformin, Metsol, Siofor, Metfogamma and Glifor. There are several formulations of Metformin available to the market, and all but the liquid form have generic equivalents. Metformin IR (immediate release) is available in 500-, 850-, and 1000-mg tablets, while Metformin XR (extended release) is available in 500-, 750-, and 1000-mg strengths (also sold as Fortamet, Glumetza, and Glucophage XR in the US). Also available is liquid metformin (sold as Riomet in the US), where 5 mL of solution contains the same amount of drug as a 500-mg tablet.