?
before
p
after
q
every
d
day
am
Morning
pm
Afternoon
qh
every hour
q2h
every 2 hours
ac
before meals
q3h
every 3 hours
pc
after meals
q4h
every 4 hours
qid
four times a day
prn
as often as necessary
bid
two times a day
tid
three times a day
stat
immediately
MN
midnight