Is this correct? BRAND-NAMES Glucophage 500, 850, 1000 Glucophage XR 500, 750 Fortamet 500, 1000 [a 'special' XR fomulation of Metformin, max 2500 as per PI] Glumetza 500, 1000 [another 'special' XR fomulation of Metformin, max 2000 as per PI] GENERIC-NAMES Metformin 500, 850, 1000 Metformin ER 500, 750 (No ER 1000?) My understanding is that only Glucophage and Glucophage XR have cheap generic substitutes. Glumetza does not have a generic but you can recommend that the patient give generic Metformin ER a try to save money. Fortamet has the following generic: NDC - 68180-0336/7 (Lupin's 500 and 1000mg Metformin ER - high WAC on Red Book Online, but a lot lower than the brand). So, if a doctor writes Fortamet without 'DAW,' you MUST (New York State) substitute with the relatively-expensive-but-cheaper-than-brand generic by Lupin.