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Generally abbreviated to "P.R.N." or "PRN", pro re nata refers to the administration of prescribed medication whose timing is left to the patient (in the case of patient-controlled analgesia), nurse, or caregiver, as opposed to medication that is taken according to a fixed (primarily daily) schedule (a.k.a. "scheduled dosage").
AMA style avoids use of this abbreviation (spell out "orally") ppt. præparata: prepared p.r., PR per rectum: rectally p.r.n., PRN pro re nata: as needed PRN is pertactin, a virulence factor of the bacterium that causes pertussis: pt. perstetur: continue pulv. pulvis: powder p.v., PV per vaginam: vaginally q quaque: every, per q.1 h, q.1 ...
prn PRN: as necessary (from Latin pro re nata) (if used in chronic pain control, sometimes disparagingly termed "pain relief nil") as needed Prog: prognosis PROM: prelabor rupture of membranes partial range of motion [1] PRP: panretinal photocoagulation platelet-rich plasma progressive rubella panencephalitis: PRRE: purine-rich response element PRV
The main discussion of these abbreviations in the context of drug prescriptions and other medical prescriptions is at List of abbreviations used in medical prescriptions. Some of these abbreviations are best not used, as marked and explained here.
prn as needed from the Latin pro re nata: PT prothrombin time ... Medical Abbreviations: 32,000 Conveniences at the Expense of Communication and Safety (15th ed ...
PRN pro re nata "for the thing born" As used in standard medical jargon, PRN is understood to mean "as needed". This reading of the abbreviation implies that the delivery of the prescription (by a suitable person, following a medications protocol) is done in a reactive, passive way, e.g., "when that happens, do this".
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It would be a simple matter to create an annotated list merging List of abbreviations used in medical prescriptions and List of medical abbreviations: Do-not-use list. Perhaps abbreviations on the official United States Do-Not-Use list could have a red background, abbreviations which are not recommended a yellow background and the rest the ...