Prescription Abbreviations

Abbreviations used in prescriptions:

  • a.c. (ante cibum) – before meals
  • ad lib. (ad libitum) – use as much as one desires; freely
  • alt. h. (alternis horis) – every other hour
  • c (cibos) – food
  • D.A.W. – dispense as written
  • dc, D/C, disc – discontinue
  • e.m.p. (ex modo prescripto) – as directed
  • ex aq – in water
  • h.s. (hora somni) – at bedtime
  • L.A.S. – label as such
  • N.K.A. – no known allergies
  • noct. (nocte) – at night
  • NPO, n.p.o. (non per os) – nothing by mouth
  • p.c. (post cibum) – after meals
  • p.o. (per os) – by mouth or orally
  • s.a. (secundum artum) – use your judgement
  • sig – write on label
  • s.o.s., si op. sit (si opus sit) – if there is a need

Napoleon Bonaparte described medicine as “a collection of uncertain prescriptions the results of which, taken collectively, are more fatal than useful to mankind.”