Type 2 Markings on metformin different

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Type of diabetes
Type 2
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Insulin
The metformin tablets I took this morning had a 'C' on one side and '323'. Seemed strange so I opened a new box and found '500' on one side and the other side blank. The leaflet in the newly opened box says this is what the marking should be. Why then is the other different?

Metformin markings.jpg
 
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EllieM

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medine.co.uk says
Metformin Tablets 500 mg are white, round, biconvex tablets engraved with “C” on one side and “323” on the other side, available in blister packs of 28, 56 or 84 tablets

So that explains the first box

The second?
Click on pharmaceutical properties to see the description
White coloured, film-coated, round, biconvex tablets embossed '500' on one side (without break score).

Two different manufacturers?
 

catinahat

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They are both 500mg Metformin tablets.
the one blister pack has Crescent pharma Ltd and a serial no 20416/0 323
I'm guessing that the 'C' stands for Crescent and the 323 is the last 3 numbers of the serial
As EllieM said, different manufacturers, same drug
 

LivingLightly

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I'm a metformin user.

This is one of the reasons all medication is now dispensed in blister packs as opposed to loose tablets in a bottle. Your photos show that both packs contain tabs of the same drug at the correct dose, in this case metformin hydrochloride 500 mg.