List of medical abbreviations: Latin abbreviations - Wikipedia
https://en.wikipedia.org/wiki/List_of_medical_abbreviations:_Latin_abbreviations
WEBafter food: post cibum p.m., pm, PM afternoon or evening: post meridiem: p.o., po, PO by mouth / oral administration: per os / nonstandard form per orem: p.r., pr, PR rectally / rectal administration: per rectum: p.r.n., prn, PRN as needed, (also Pertactin - a key antigen of ac.Pertussis vaccine) pro re nata: q. every quaque: q.1.h., q1h every ...
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