Table 1. Common Terms and Abbreviations
Term or Phrase	Abbreviation	Meaning
ad	ad	to, up to
ad libitum	ad. lib.	at pleasure
ana	a.a.	of each
ante cibos	a.c.	before meals
aqua	aq.	water
bis in die	b.i.d.	twice a day
collyrium	collyr.	eye lotion
cum	c.	with
cum aqua	cum aq.	with water
dentur tales doses	d.t.d.	give such doses
dispensa	disp.	dispense
et	et	and
gutta, guttae	gtt.	drop, drops
hora somni	h.s.	at bedtime
in vitro	in vit.	in glass
misce	m.	mix
non repetatur	non. rep.	do not repeat
oculus dexter	o.d.	right eye
oculus sinister	o.s.	left eye
omni die	o.d.	daily
omni mane	o.m.	every morning
omni nocte	o.n.	every night
per os	p.o.	by mouth
placebo	placebo	to please
post cibos	p.c.	after meals
pro re nata	p.r.n.	as the occasion arises
quantum sufficiat	q.s.	sufficient quantity
quater in die	q.i.d.	four times a day
recipe	Rx	take
semis	ss _	one-half
sine	s,s	without
si opus sit	s.o.s.	if necessary
ter in die	t.i.d.	three times a day
trochiscus, torchisci	troch.	lozenge, lozenges
unguentum	ungt.	ointment
ut dictum	ut dict.	as directed

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Table 2. Approximate Weight and Measure Equivalents
Liquid Measure Metric Approximate Apothecary Equivalents  Metric  Approximate Apothecary Equivalents  1000 ml 1 quart 3 ml 45 minims 750 ml 1-1/2 pints 2 ml 30 minims 500 ml 1 pint 1 ml 15 minims 250 ml 8 fluid ounces 0.75 ml 12 minims 200 ml 7 fluid ounces 0.6 ml 10 minims 100 ml 3-1/2 fluid ounces 0.5 ml 8 minims 50 ml 1-3/4 fluid ounces 0.3 ml 5 minims 30 ml 1 fluid ounce 0.25 ml 4 minims 15 ml 4 fluid drams 0.2 ml 3 minims 10 ml 2-1/2 fluid drams 0.1 ml 1-1/2 minims 8 ml 2 fluid drams 0.06 ml 1 minims 5 ml 1-1/4 fluid drams 0.05 ml 3/4 minims 4 ml 1 fluid dram 0.03 ml 1/2 minims	Weight Weight Approximate Apothecary Equivalents  Metric Approximate Apothecary Equivalents  30 Gm 1 ounce 30 mg 1/2 grain 15 Gm 4 drams 25 mg 3/8 grain 10 Gm 2-1/2 drams 20 mg 1/3 grain 7.5 Gm 2 drams 15 mg 1/4 grain 6 Gm 90 grains 12 mg 1/5 grain 5 Gm 75 grains 10 mg 1/6 grain 4 Gm 60 grains (1 dram) 8 mg 1/8 grain 3 Gm 45 grains 6 mg 1/10 grain 2 Gm 30 grains (1/2 dram) 5 mg 1/12 grain 1.5 Gm 22 grains 4 mg 1/15 grain 1 Gm 15 grains 3 mg 1/20 grain 0.75 Gm  12 grains 2 mg 1/30 grain 0.6 Gm 10 grains 1.5 mg 1/40 grain 0.5 Gm 7-1/2 grains 1.2 mg 1/50 grain 0.4 Gm 6 grains 1 mg 1/60 grain 0.3 Gm 5 grains 0.8 mg 1/80 grain 0.25 Gm 4 grains 0.6 mg 1/100 grain 0.2 Gm 3 grains 0.5 mg 1/120 grain 0.15 Gm 2-1/2 grains 0.4 mg 1/150 grain 0.12 Gm 2 grains 0.3 mg 1/200 grain 0.1 Gm 1-1/2 grains 0.25 mg 1/250 grain 75 1-1/4 grains 0.2 mg 1/300 grain 60 mg 1 grain 0.15 mg 1/400 grain 50 mg 3/4 grain 0.12 mg 1/500 grain 40 mg 2/3 grain 0.1 mg 1/600 grain