How does 40 nanograms of an opiate translate in milagrams of a pill?

To convert nanograms to milligrams, you divide the number of nanograms by 1,000,000, since there are 1,000,000 nanograms in a milligram. Therefore, 40 nanograms is equal to 0.00004 milligrams. This means that 40 nanograms of an opiate is a very small amount, significantly lower than the typical dosage found in most prescription pills, which usually contain milligrams of active substance.