What is essential when using a multidose vial?

Using a sterile needle and syringe is crucial when working with a multidose vial to prevent contamination and possible infection. Each time medication is drawn from the vial, there's a risk of introducing bacteria or other pathogens if the equipment is not sterile. Keeping the needle and syringe sterile ensures the medication remains safe for patient use and reduces the risk of healthcare-associated infections.

In contrast, disinfecting the rubber stopper of the vial is typically recommended to minimize the risk of introducing contaminants. Injecting unneeded medication back into the vial is contraindicated as it can lead to contamination of the remaining medication. Using any type of needle is not safe, as only sterile equipment specifically designed for drawing and administering medication should be used to maintain aseptic technique.