What is the typical feature of multidose vials that distinguishes them from single dose vials?

Multidose vials are typically distinguished by their inclusion of preservatives. These preservatives are essential for maintaining the sterility and stability of the medication after the vial has been opened and accessed multiple times. Unlike single dose vials, which are designed for one-time use and do not contain preservatives—because they are intended to be used immediately—multidose vials are made to allow several doses to be extracted over time. The presence of preservatives in multidose vials enables them to remain safe and effective even after multiple entries, preventing contamination and degradation of the product throughout its use. This key feature plays a crucial role in ensuring patient safety and efficacy in medication administration.