Some important abbreviations are used in prescription writing.
- ad lib. - ad libitum - at pleasure
- a.c. - ante cibum - before meals
- aq. - aqua - water
- b.i.d. - bis in die - twice a day
- caps. - capsula - capsule
- d. - dies - a day/everyday
- gtt. - guttae - drops
- p.c. - post cibum - after meals
- q.h. - quaque hora - every hour
- q.4.h. - quaeque quarta hora - every 4 hours
- q.i.d. - quarter in die - four times a day
- stat. - statim - immediately
- tab. - tabella - tablet
- t.i.d. - ter in die - three times a day
- h. - hora - hour
- c - cum - with
- sos - si opus sit - if necessary
- P.O. - per os - by mouth
- om - omni mane - every morning
- on - omni nocte - every night
