a.c.
Before meals
p.c.
After meals
Ad lib
At pleasure; freely
AM
Morning
PM
Evening
Disc
Discontinue
ASAP
As soon as possible
ACT
Around the clock
NTE
Not to exceed
NMT
Not more than
noct.
At night or Evening
Non rep
Do not repeat
PRN
As needed
STAT
Immediately
s.o.s.
only when needed