Pharmaceutical Calculations

Q: One hundred (100) micrograms equals I. 100,000 nanograms II. 0.1 milligrams III. 0.001 grams

(a) :  I only
(b) :  III only
(c) :  I and II only
(d) :  II and III only
(e) :  I, II, and III
Answer:  I and II only
Explanation:  1 mg 1g_ 100 mcg x 1000 mcg x 1000 mg - 0.0001 g In this example, consider one microgram as equaling 1000 nanograms; thus, 100 mcg = 100,000 ng. Since 1 milligram equals 1000 mcg, 100 mcg equals 0.1 mg. If 1 mg equals .001 gram, 0.1 mg or 100 mcg equals 0.0001 g. It may be clearer if one solves this conversion using di- mensional analysis.

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