What does ER mean in Prescription?

This page is about the meanings of the acronym/abbreviation/shorthand ER in the Medical field in general and in the Prescription terminology in particular.

extended release

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What does ER mean?

erbium, Er, atomic number 68(noun)
a trivalent metallic element of the rare earth group; occurs with yttrium

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"ER." Abbreviations.com. STANDS4 LLC, 2015. Web. 9 Oct. 2015. <http://www.abbreviations.com/term/1421693>.