What is an ampule?

An ampule is defined as a single-dose glass vial that has an indented neck, which makes it easy to break open. This design is specifically intended to maintain the sterility of the medication contained within until it is ready to be used. The glass material helps protect the contents from contamination and degradation, ensuring that the medication remains effective until administration.

In contrast, the other options describe different types of containers or devices that do not accurately represent an ampule. A large container for storing multiple doses suggests a vial or bottle designed for repeated access, which does not match the single-use characteristic of an ampule. A reusable syringe refers to a device for injecting medications rather than a storage vessel, and a plastic container for powdered medications implies a different format not specific to the glass ampule structure.