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Metformin Hydrochloride Tablets USP are oral antihyperglycemic drugs used in the management of type 2 diabetes.
https://www.drugs.com/pro/metformin.html
http://www.diabetesincontrol.com/link-between-metformin-and-neuropathy-b12-deficiency/
http://www.diabetescure101.com/metformin.html