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pro re nata
''Pro re nata'' is a Latin phrase meaning ''in the circumstances'' or ''as the circumstance arises''.〔''Oxford Latin Dictionary'' s.v. nascor ~ī nātus (p. 1156)〕 It is commonly used in medicine to mean ''as needed'' or ''as the situation arises''. It is generally abbreviated to p.r.n. or PRN in reference to dosage of prescribed medication that is not scheduled; instead, the decision of when to administer the drug is left to the nurse, caregiver, or patient (such as in patient-controlled analgesia). ''Pro re nata'' does not imply that the patient may take as much of the medicine as desired, but rather that the medicine may be taken in the prescribed dosage ''if needed''. Such administration of medication is not meant to imply, and should never allow for, exceeding a maximum daily dosage. This aspect of "only if needed, and only up to some maximum" makes ''pro re nata'' dosages (which are common) differentiable from ''ad libitum'' dosages (which are not common).
==Other uses==
''Pro re nata'' is sometimes used for blood tests. A physician will write a p.r.n. order for blood work. The patient may then use that order when needed.
The initials p.r.n. may also refer to casual, or "as needed", employment.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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