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Drug Abbreviations

These are some of the most commonly used drug abbreviations:

    • a.c. before meals or food
    •  
      b.i.d. twice daily
    • h.s. at bedtime
    • p.c. after meals
    • p.o. by mouth
    • p.r.n. as needed
    • O.D. right eye
    • O.S. left eye
    • O.U. each eye
    • mcg microgram(s)
    • mg milligram(s)
    • mEq milliequivalent(s)
    • ML milliliter(s)
    • q.o.d. every other day
    • q.h. every hour
    • q.4h. every four hours
    • q.8h. every eight hours
    • q.i.d. four times a day
    • q.o.d. every other day
    • t.i.d. three times a day

 

Examples:

  • Remeron 30 mg p.o. q.h.s.
  • Amikacin 430 mg p.o. q.8h.
  • Pepcid 20 mg p.o. q.h.s.
  • Meropenem 1 gram IV q.8h.
  • Cisapride 10 mg p.o. q.i.d. p.r.n.
  • Meropenem 1 gram IV q.8h.
  • Lescol 20 mg p.o. q.h.s.
  • Paxil 40 mg p.o. q.d.
  • Keflex 500 mg p.o. q.i.d.
  • Enteric-coated aspirin 81 mg p.o. q.d.
  • Morphine soluble tablets one p.o. q.2-4h. p.r.n. breakthrough pain.
  • Dextromethorphan 15 mg p.o. t.i.d.