First of all 1 gram (g) equals 1000 milligrams (mg), and 1 mg equals 1000 micrograms (ug), so 1 gram equals 1,000,000 micrograms, i.e., 1g = 10^6ug. Kilograms, grams, milligrams, micrograms, nanograms, picograms for the unit of weight, the conversion unit between into the mass of 1000; 1000 grams (g) = 1 kilogram (kg), 1000 milligrams (mg) = 1 gram (g), 1000 micrograms (μg) = 1 milligrams (mg); grams, milligrams and so on for the international unit of measurement, in the international community is common. In medicine, there are many test results using these units, such as the dose of drugs, vitamin content, etc., especially the dose of antibiotics more than the use of mass as the unit of dosage, in the use of the unit of dosage should pay attention to the conversion between.