If the order is for 500 mg of a drug, how many grams is this?

To convert milligrams to grams, it is important to remember the relationship between these two units of mass: 1 gram (g) is equal to 1,000 milligrams (mg). Therefore, to convert milligrams to grams, you divide the number of milligrams by 1,000.

In this case, 500 mg can be converted to grams by using the following calculation:

500 mg ÷ 1,000 = 0.5 g.

This shows that 500 milligrams is equivalent to 0.5 grams.

Thus, the correct answer accurately represents this conversion. Understanding these basic unit conversions is essential for pharmacy technicians, as they frequently deal with dosage calculations that require switching between different units of measurement.