Containers that contain preservatives for multiple doses of medication.

• A. Single-Dose Vials
• B. Multidose Vials
• C. Ampules
• D. Vials

Answer: (B)

The key idea is how packaging enables multiple uses. Containers that contain preservatives are designed to be used for more than one dose, because the preservative helps prevent microbial growth after the container is punctured and multiple withdrawals are made. That’s why this kind of container is called multidose. It allows repeated dosing from the same vial while keeping the medication safer between uses, as long as proper aseptic technique is followed and the container is used within its recommended open-use period.

Single-dose vials are meant for one administration only and typically do not contain preservatives, so they’re not suitable for multiple uses. Ampules are also single-use and are opened and discarded after one use, with no preservative to extend their life. Vials is a broader term that could refer to either single-dose or multidose, but the specific trait in the question—preservatives for multiple doses—points to multidose vials.