Pfizer has started to attach radio-frequency identification(RFID)tags to all packs of Viagra(sildenafil)sold in the US.This means that pharmacies and wholesalers can confirm the authenticity of packs using specially designed scanners that use the internet to check an electronic code embedded in the tags against a Pfizer database.The tags cannot currently be used to track and trace products as they move through the supply chain because that would require all distributors to invest in the necessary technology and agree to share information about product movement.
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