"P" stands for "patient". It means refills have been pre-authorized by the doctor and can be called in by the patient.
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In a letter, "P. S." means "Post Script."
Prescription glasses, or maybe, petticoat, pocket protector, panama hat, pullover, pajamas, pumps, pennyloafers, parka, pocket-T ...
pyre
EVERY PRESCRIPTION WRITTEN by a doctor must include, among other things, the intended route of the medicine (how to take it). PO means you take the drug orally and PR means you take the drug rectally (as in a suppository).
Petrified.