What does the abbreviation "AU" signify?

The abbreviation "AU" stands for "auris utraque," which is Latin for "both ears." This term is often used in medical prescriptions and instructions to specify that a treatment or medication should be applied to both ears simultaneously. Understanding this abbreviation is critical in a pharmacy setting, as accurate communication regarding medication use is essential for patient safety and effective treatment. In contrast, the abbreviations for right ear and left ear refer specifically to individual sides (with "AD" for right ear and "AS" for left ear), and "around the clock" typically uses an abbreviation such as "ATC." Recognizing "AU" as a term that applies to both ears is important for preventing misunderstandings when dispensing auditory medications or treatments.