One cubic centimeter is equivalent to 20 drops. There are three systems used to measure doses of medication. The household system uses drops, teaspoons and tablespoons to measure volumes of liquid medication. A teaspoon contains 60 drops, and a tablespoon holds three teaspoons.

The old, rarely used apothecary system of measurements used the grain, the dram and the ounce to define doses of medication. The metric system, using grams and liters, is the most commonly used method of measuring doses of medication today. The cubic centimeter is also commonly used in medicine as a volume measurement and it is equivalent to one milliliter.