The full title of this publication,including its supplements,is The Pharmacopeia of the United States of America,Twenty-Eighth Revision.This title may be abbreviated to United States Pharmacopeia,Twenty-Eighth Revision,or to USP28.The United States Pharmacopeia,Twenty-Eighth Revision,supersedes all earlier revisions.Where the term “USP”is used,without further qualification,during the period in which this Pharmacopeia is official,it refers only to USP28and any supplement(s)thereto.The same titles,with no further distinction,apply equally to print or electronic presentation of these contents.