(Akiit.com) Multi-dose vials are common for a reason. They’re more cost-effective than a single-dose package, cut down on waste, and are a better option when patients need to be dosed over a longer period of time. However, when it comes to ensuring their safety, these practices are not just recommendations. They are the difference between a vial that stays sterile and one that silently transmits pathogens between patients.
Know The Difference Between Vial Types Before Anything Else
All vials are not created the same, and mixing them up is one of the most common mistakes in both clinical and laboratory environments.
Multi-dose vials (MDVs) contain antimicrobial preservatives – typically benzyl alcohol – which actively hinder bacterial growth between applications. This preservative facilitates repeated access. Single-dose vials lack this protective feature. Once they have been opened, they must be utilized and then disposed of. If a single-dose vial is re-used, even with the same patient, the protective guard against microbial contamination is no longer available.
The same concept would also be applicable for diluents. Sterile water with no preservatives is to be used once. Bacteriostatic water incorporates benzyl alcohol in order for bacterial growth to be minimized with repetitive entries, hence making it suitable for reconstitution with multiple entries – in contrast to sterile water which should be thrown away immediately post entry.
Your team must categorize each product as to which classification it is prior to drawing a single dose. This should be done upon stocking the product; it should not have to be determined at the time of use.
One Needle, One Syringe, One Time – No Exceptions
As simple as it may sound, this is a rule that is still occasionally broken.
Somehow, there’s still a belief in the medical community that changing the needle on a previously used syringe will make the syringe safe for a second, third, or fourth entry into a shared vial of medication. Unfortunately, changing the needle just before re-entry doesn’t change the fact that the plunger mechanism creates backflow. Blood or biological fluid from a previous patient’s draw can be pushed back into the vial with the new, clean needle. Once it gets in the vial, it’s in every subsequent dose, too. Outbreak investigations have traced bloodborne pathogens, most notably Hepatitis B and Hepatitis C, to just this scenario.
Follow the One Needle, One Syringe, One Time, One Patient maxim absolutely and without exception. New syringe for every access to a multi-use vial. Post this policy in medication preparation areas. Include it on your orientation checklist. Enforce it as a non-negotiable.
Septum Disinfection Isn’t Optional – and Drying Matters
Before inserting your needle into that multi-dose vial, you first must wipe the rubber septum with an isopropyl alcohol prep pad. And details matter – more than you might think, and more than most people give it credit for.
A 70% isopropyl alcohol prep pad should be used for this purpose and is to be rubbed in a circular motion over the rubber diaphragm for at least 10 to 15 seconds. Using the same prep pad over multiple rubber septa is another skip that can compromise the sterility of the vial’s contents.
Then wait for the alcohol to dry completely before puncturing the vial. Moist alcohol can be pushed into the vial by the needle, and some delicate formulations are particularly sensitive to this kind of contamination. More pragmatically, the antiseptic germ-killing action of isopropyl alcohol is proven to require sufficient wetting to be effective.
Label Every Vial The Moment It’s First Opened
A vial with no open date on the label is a liability for your organization.
CDC and USP General Chapter guidelines are clear on this: multi-dose vials have to be thrown out 28 days after first puncture unless the manufacturer tells you otherwise. That 28-day discard rule isn’t arbitrary; the effectiveness of preservatives wanes over time. Benzyl alcohol operates as a fungistatic agent by inhibiting multiplication over a window of time, not a magic wand that suddenly poofs away all microbial life.
Make double-date labeling a non-negotiable expectation. The moment a vial is first punctured you write two dates directly onto the label: the date of opening and the calculated discard date. Don’t trust the pharmacy to do it for you or do math in your head at the point of care.
This applies not only in the clinic but in laboratory contexts as well. Multi-dose reagents, controls, and standards in the lab need the same level of diligence with open dating and expiration tracking.
Store and Access Vials Away From Treatment Areas
The location where vials are handled is equally important as how they are handled.
Preparation of medications from vials should take place in a preparation room or clean bench – removed from the patient environment. Treatment rooms, bedside carts, and procedure areas present a higher risk of contamination from particulates in the air, patient contact, and general clinical traffic.
Cross-contamination is not solely the result of a shared needle. Environmental co-exposure such as a sneeze, an open wound in close proximity, hands that touched a surface prior to a vial’s septum, can compromise a vial septum before the needle ever touches it.
Strictly forbid multi-use vials from ever being taken into an uncontrolled patient care environment. Rule: they remain in the preparation/clean room. If taken into a patient room, they can never return to shared storage; they must be discarded. From that moment on, any vial taken into a patient care area is “patient specific.”
The Compliance Case Is Also The Clinical Case
Adhering to these five best practices is pertinent in implementing a safe medication workflow. Failure at just one of these steps can lead to dire consequences for patients. Similarly, optimal infection prevention in healthcare can only be effective when these important best practices are simply part of how the work is done.
Train to these standards. Audit against them. Make the protocols visible where the work happens.
Staff Writer; Sasha Love