NPO, nil per os
nothing by mouth
ac, ante cibum
before meal
po, post cibum
After meal
hs, hora somnei
Before bed time
SL
Sublingual
BU
Buccal (behind cheek)
IV
Intravenous
SQ, SC
Subcutaneous
IM
Intramuscular
AM
Morning
PM
Evening/ afternoon
Q
Each/every
QD
Every day (once daily)
QOD
Every other day
BID
Twice a day
TID
Three times a day
QID
Four times a day
qh
Every hour
PRN
As necessary
PO, per os
by mouth