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Also known as "Sig Codes", Prescription abbreviations are basically coded instructions from a health-care professional. The code is used to supply the words while Roman Numerals are sometimes used for the numbers.

Rx = Treatment.
Hx = History
Dx = Diagnosis
q = Every
qd = Every day
qod = Every other day
qh = Every Hour
S = without
SS = On e half
C = With
SOS = If needed
AC = Before Meals
PC = After meals
BID = Twice a Day
TID = Thrice a Day
QID = Four times a day
OD = Once a Day
BT = Bed Time
hs = Bed Time
BBF = Before Breakfast
BD = Before Dinner
Tw = Twice a week
SQ = sub cutaneous
IM = Intramuscular . .
ID = Intradermal
IV = Intravenous
QAM = (every morning)
QPM (every night)
Q4H = (every 4 hours)
QOD = (every other day)
HS = (at bedtime)
PRN = (as needed)
PO or "per os" (by mouth)
AC (before meals)
PC = (after meals)
Mg = (milligrams)
Mcg/ug = (micrograms)
G or Gm = (grams)
1TSF ( Teaspoon) = 5 ml
1 Tablespoonful =15ml

Download the Medical and pharmacy abbreviations ( sig codes ). pdf

Pharmacy sign code abbreviations
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