500 g Pantothenic acid
30 g pyridoxine HC1
200 g Tocopherol
(20)
162.5 g
Section VI. COMMON SYSTEMS OF MEASURE
1-39. INTRODUCTION
a. There are two common systems of measure. They are the avoirdupois
system, which we use in everyday life, and the apothecary system, which, as the name
suggests is the one used by pharmacists and alchemists.
b. In the pharmacy, both systems have been replaced, for the most part, by the
metric system. Prescriptions and drug orders could, however, have the weights or
volumes expressed in units of one of the common systems. To facilitate the
interpretation of these prescriptions, the relationships and conversion factors contained
in this lesson must be committed to memory.
1-40. WEIGHT: AVOIRDUPOIS SYSTEM
a. Weight will almost always be expressed in the avoirdupois system when the
common systems are used. The basic unit of weight in the avoirdupois system is the
grain (gr). The larger units are the ounce (oz) and the pound (lb). You must know the
following relationships between the avoirdupois units:
1 lb =
16 oz
1 oz =
437.5 gr
b. To convert from the avoirdupois system to the metric system, you must know
these conversion factors:
1 gr =
65 mg
1g
=
15.4 gr
1 oz =
28.4 g
1 kg =
2.2 lb
MD0802
1-58
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