Vials of medication can be classified as:

Vials of medication can indeed be classified as either multi-dose or single-dose, which denotes the amount of medication each vial contains and how it is intended to be used.

A single-dose vial contains a quantity of medication that is intended for one-time use. Once it is opened, all contents should be used immediately and any leftover should be discarded. This helps to minimize the risk of contamination and ensures that the medication retains its potency.

On the other hand, a multi-dose vial contains enough medication for multiple administrations, allowing the clinician to withdraw portions of the medication over time. These vials have preservatives that help to reduce the risk of contamination and prolong the shelf life of the medication once opened.

This classification is important for veterinary professionals as it helps determine how medications can be properly utilized, stored, and administered, ensuring both efficacy and safety in treatment protocols.