What is the meaning of O.U. in medication administration?

The abbreviation O.U. stands for "oculus unitas," which is Latin for "both eyes." In medication administration, this term is often used when prescribing eye drops or ointments that are intended to be applied to both eyes. Understanding this abbreviation is crucial for ensuring that patients receive the correct dosage and treatment in both eyes when needed.

The other options provided refer to different concepts in medication administration but are not associated with the term O.U. For instance, "once only" indicates a one-time dose, "as needed" refers to medications taken at the patient’s discretion, and "every other day" denotes a dosing schedule. Each of these has its distinct abbreviation and usage in medical contexts, but they do not apply to the meaning of O.U.