Metformin 500 Pill Markings

I have been taking Metformin for several years now, small round pill 3/8" diameter, one side says MF W/Line Underscore in middle of pill, then the number 1 underneath. The other side has a large letter G. My last prescription is larger round pill 1/2" in diameter, one side says RBX with a line through centre of pill, the other side says R12. The larger pill is considerably harder to swallow. What's the story here?

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The tablet with the RBX R12 marking also contains 500mgs of Metformin, it has just been manufactured by a different company, in this case Ranbaxy pharmaceuticals. The size difference is probably due to their using different inactive ingredients.

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