What does "P.o. q.4-6h. p.r.n." mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
"P.o. q.4-6h. p.r.n." is a medical instruction for taking medication. "P.o." means the medicine should be taken by mouth. "q.4-6h" means it should be taken every 4 to 6 hours. "p.r.n." means it should be taken as needed, so if the symptoms the medicine is meant to treat aren't present, it doesn't need to be taken.
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