Abbreviations

Abbreviations

Abbreviations are often used in the prescription of drugs. Most are based on Latin.

ad lib = when desired/freely (ad libitum)
a.c. = before meals (ante cibum)
b.i.d. = twice a day (bis in die)
d. = a day
h. = an hour (hora)
h.s. = at bedtime (hora somni)
gtt = drops (guttae)
int. cib. = between meals
int. noct. = during the night
noct. = at night
od = every day (omni die)
om = every morning (omni mane)
on = every night (omni nocte)
os = mouth (os)
p.c. = after meals/food (post cibum)
prn = as required (pro re nata)
q.i.d. = four times a day (quarter in die)
q. = every (quaque)
sig. = write or label
t.i.d. = three times a day (ter in die)
SL = under the tongue (sub lingua)
SOS = if it is necessary (si opus sit)
ss = ½ (semisse)

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