-
ad lib
freely, as desired
-
-
-
-
-
b.i.d./B.I.D.
twice a day
-
-
-
-
-
-
H.S or h.s
hours of sleep
-
-
-
-
I.U./IU
International units
-
IVPB
Intravenous piggyback
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
prn, PRN
whenever necessary
-
-
-
-
-
-
-
q.i.d or Q.I.D
four times a day
-
-
-
-
SC, s.c, s.q
subcutaneously
-
-
-
-
tid or T.I.D
three times a day
-
-
-
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