Table 15-11.

Common Abbreviations Used in Prescription Writing.

a.c.	before meals	o.d.	right eye
a.d.	right ear	o.s.	left eye
ad lib	at pleasure	o.u.	both eyes
adm	administer	oz	ounce
aq	water	p.c.	after meals
a.s.	left ear	PO (p.o.)	per os
a.u.	both ears	prn (p.r.n.)	as needed
b.i.d.	twice a day	q. (q)	every
c.	with	q.d.	every day
cap(s)	capsule(s)	q4h	every 4 hours, etc.
cc	cubic centimeter	q24h	once a day
disp	dispense	q.i.d.	four times a day
fl oz	fluid ounce	q.o.d.	every other day
g (gm)	gram	q.s.	a sufficient quantity
gr	grain	®	trademarked name
gtt(s)	drop(s)	SC (SQ)	subcutaneously
h (hr)	hour	Sig:	instructions to patient
h.s.	at bedtime	sol’n	solution
IM	intramuscularly	stat	immediately
inj	inject	susp	suspension
IP	intraperitoneally	tab(s)	tablet(s)
IV	intravenously	Tbs	tablespoon
kg	kilogram	t.i.d.	three times a day
lb	pound	tsp	teaspoon
mg	milligram	ut dict.	as directed
mL	milliliter