ac; a.c.; AC
before meals
AM; a.m.
morning
b.i.d.; BID
twice daily
h;hr
hour
h.s.; HS
bedtime
p.c.; PC
after meals
PM; p.m.
afternoon; evening
PRN; p.r.n.
as needed; as occasion requires
q.h.; qhour
every hour
q.i.d.; QID
four times daily
q4h; q 4 h
every 4 hours
q6h; q 6 h
every 6 hours
QAM; qam
every morning
qDay ;QD
every day
QOD; Q.O. Day
every other day
QPM; qpm
every evening
qwk; qweek
every week
Stat
immediately; now
t.i.d.; TID
three times daily
t.i.w.; TIW
three times a week