prn

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prn

(in prescriptions) abbreviation for

(Pharmacology) pro re nata

[Latin: as the situation demands; whenever needed]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

p.r.n.

(in prescriptions) as the occasion arises; as needed.

[< Latin prō rē nātā]

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Adv.

PRN - according to need (physicians use PRN in writing prescriptions); "add water as needed"

as needed, as required, pro re nata

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