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AMA style avoids use of this abbreviation (spell out "orally") ppt. præparata: prepared p.r., PR per rectum: rectally p.r.n., PRN pro re nata: as needed PRN is pertactin, a virulence factor of the bacterium that causes pertussis: pt. perstetur: continue pulv. pulvis: powder p.v., PV per vaginam: vaginally q quaque: every, per q.1 h, q.1 ...
The main discussion of these abbreviations in the context of drug prescriptions and other medical prescriptions is at List of abbreviations used in medical prescriptions. Some of these abbreviations are best not used, as marked and explained here.
prn PRN: as necessary (from Latin pro re nata) (if used in chronic pain control, sometimes disparagingly termed "pain relief nil") as needed Prog: prognosis PROM: prelabor rupture of membranes partial range of motion [1] PRP: panretinal photocoagulation platelet-rich plasma progressive rubella panencephalitis: PRRE: purine-rich response element PRV
Generally abbreviated to "P.R.N." or "PRN", pro re nata refers to the administration of prescribed medication whose timing is left to the patient (in the case of patient-controlled analgesia), nurse, or caregiver, as opposed to medication that is taken according to a fixed (primarily daily) schedule (a.k.a. "scheduled dosage").
Abbreviation Term Description (notes) A.d. As directed bd/bid Twice a day gt One drop gtt drops GSL General sales list Gutt/g Guttae (drops) Meds Medications Nocte/QHS At night Occ Ointment od/QD Once a day otc Over the counter (bought medication) P Pharmacy (drug) POM Prescription-only medicine prn When required q
Pronunciation follows convention outside the medical field, in which acronyms are generally pronounced as if they were a word (JAMA, SIDS), initialisms are generally pronounced as individual letters (DNA, SSRI), and abbreviations generally use the expansion (soln. = "solution", sup. = "superior").
List of medical abbreviations: Overview; List of medical abbreviations: Latin abbreviations; List of abbreviations for medical organisations and personnel; List of abbreviations used in medical prescriptions; List of optometric abbreviations
Abbreviation Meaning T: Thoracic Vertebrae. Testosterone. T x: Treatment: T3 Triiodothyronine: T4 Thyroxine: TA: temporal arteritis T&A: tonsillectomy with adenoidectomy: T&C: type and cross-match (see blood transfusion) T&S: type and screen (blood; e.g., to prepare for blood transfusion) Tab: Tablet (pharmacy) TAB Therapeutic abortion ...