Which abbreviation indicates a drug given in both ears?

The abbreviation that indicates a drug administered in both ears is "AU." This abbreviation comes from the Latin term "auris utraque," which translates to "both ears." In veterinary medicine, when a medication is prescribed to be given in both ears, the veterinarian might use this abbreviation to clearly specify the intended route of administration, ensuring that the medication is applied correctly for optimal efficacy and safety.

The other abbreviations do not denote administration in both ears. "PO" stands for "per os," meaning medication taken orally. "IM" refers to "intramuscular," which indicates that the medication is injected into a muscle. "SC" stands for "subcutaneous," meaning that the medication is administered under the skin. Each of these routes of administration serves specific purposes in veterinary care, but only "AU" specifies the dual ear treatment.