PC
after a meal
PRN
as needed
AC
before a meal
BID
two times a day
QD
once a day
HS
at bedtime
NPO
nothing by mouth
IM
into the muscle
NSAID
over the counter painkiller or analgesic
Rx
medical prescription
gtts
drops
IBS
irritable bowel syndrome
BE
Barium enema
CVA
Cardiovascular accident
MS
Multiple sclerosis
EEG
Electroencephalogram
LESI
Lumber epidural steroid injection
MRI
Magnetic resonance imaging
PET
Positron emission tomography
CT scan
Computer tomography scan