a c - ante cibum - before meals
b i d - bis in die - 2 times a day
b i n - bis in nocte - 2 times a night
h s - hora somni - at bedtime
I M - intramuscularly
I V - intravenously
o d - omni die - every day
o h - omni hora - every hour
o m - omni mane - every morning
o n - omni nocte - every night
p c - post cibum - after meals
P O - per os - by mouth
p r n - pro re nata - when required
q d - quaque die - every day
q h - quaque hora - every hour
q2h - every 2 hours q3h - every 3 hours, etc
q i d - quater in die - 4 times a day
q s - quantum satis - sufficient quantity
s c - subcutaneously
S L - sub linguam - under the tongue
S O S - si opus sit - if necessary (once only)
t i d - ter in die - 3 times a day
t i n - ter in nocte - 3 times a night