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mcg and mg are units of weight, like ounces and pounds, but are applied to tiny fractions of grams – 1 mcg = 1 microgram = one-millionth ( 1 / 1,000,000 ) of a gram 1 mg = 1 milligram = one-thousandth ( 1 / 1,000 ) of a gram = 1,000 mcg A 1.5 mg tablet is five times the dosage of a 300 mcg (.3 mg) tablet.
