The recommendation is to use the existing GS1 barcode already on the pack (i.e., EAN/UPC, GS1-128 of GS1 DataMatrix) for product identification. However, since this requires a specialised app to connect to online information, then a QR Code may be applied as a secondary barcode in addition to the GS1 DataMatrix or linear GS1 barcode. This position paper found on the GS1 Healthcare website provides more information - The key role of GS1 DataMatrix barcodes for product identification in healthcare. The QR Code should be encoded with the GS1 Digital Link URI syntax containing the same information as in the GS1 barcode.
Additional reference to barcoding of healthcare products can be found on One Product, One Barcode on the GS1 Healthcare website.
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