Which of the following systems of measurement is NOT commonly used in U.S. pharmacology?

The Imperial system is the correct answer because it is not commonly utilized in U.S. pharmacology. Instead, U.S. pharmacology primarily relies on other systems of measurement—namely, the metric system, apothecary system, and household system.

The metric system is widely used due to its standardization and ease of conversion, as it is based on multiples of ten. This system includes units such as milligrams for mass and milliliters for volume, making it efficient for dosing medications.

The apothecary system, although less common today, was historically used in pharmacy practices and includes measurements such as grains, drams, and ounces. It is often seen in older texts and some specific applications in medication compounding.

The household system is frequently used for common medications and includes measurements like teaspoons and tablespoons, making it more accessible for patients who may not be familiar with metric units.

In contrast, the Imperial system, which includes measurements like gallons, pints, and ounces, is primarily used for general purposes such as measuring distance, weight, and volume. It lacks the clarity and precision necessary for the field of pharmacology, where accurate dosing is crucial for patient safety and effectiveness of treatment. Therefore, it is not the standard measurement