I want to be able to read my prescription, what are all those abbreviations?

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I want to be able to read my prescription, what are all those abbreviations?

  i one
  ii two
  iii three
  iv four
  po Take by mouth
  QD Take once a day
  BID Take twice a day
  TID Take three times a day
  QID Take four times a day
  q12h Take every 12 hours
  q4-6h Take every 4 to 6 hours
  prn As needed or if needed
  pc After a meal
  ac Before a meal
  as Left ear
  ad Right ear
  ou Both eyes
  od Right eye
  os Left eye
  tsp teaspoonful
  ml milliliter
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