A medication card shows "Aspirin gr xx". What does this indicate?

The notation "Aspirin gr xx" refers to the measurement of the medication in grains, which is an old system of measurement still used in some contexts. In this case, "gr" stands for grains, and "xx" indicates a quantity. The Roman numeral "xx" translates to 20 in Arabic numerals, meaning that this prescription is for 20 grains of aspirin.

Understanding the relationship between grains and milligrams is important here; one grain is approximately equal to 65 milligrams. Thus, 20 grains would be a substantial dose of aspirin, highlighting why medical professionals take care to specify the measurements accurately. Recognizing this conversion and dosage measurement helps ensure that medications are administered safely and effectively.