Dosage abbreviations

Clinical Pharmacology and Toxicology

What do the following dosage abbreviations mean?

  • PO
  • PR
  • INH
  • S/L
  • PRN
  • IV
  • IM
  • PV

Accepted medical abbreviations in many hospitals include the following:
PO = Oral
PR = Per Rectum
INH = Inhaled
S/L = Sub lingual
PRN = As required (pro re nata =as the occassion arises)
IV = INtravenous
IM = intramuscular
PV = Per Vagina

Other notes:
Statins are usually given at night, Atorvastatin can be given at any time of day.
Methotrexate is once a week
GTN spray is for angina
Diazepam PR is often scripted for care homes who look after patients with epilepsy who will not have IV access or medical practitioners on site to insert it
Digoxin dose is in Microgramms
Enoxaparin S/C is one of a number of low molecular weight heparin (LMWH) drugs used in deep vein thrombosis (DVT) prophylaxis