Pro re nata is a Latin phrase meaning in the circumstances or as the circumstance arises.[1] It is commonly used in medicine to mean as needed or as the situation arises. It is generally abbreviated to p.r.n.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 the patient's prerogative.[2] Such administration of medication is not meant to imply, and should never allow for, exceeding a given daily dosage.
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