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General information, not medical advice. This page explains the vial, the supplies involved and the safety rules health-care authorities publish for vials. It gives no doses and no instructions for carrying out a procedure. The medication label, the manufacturer’s instructions and your prescriber, nurse or pharmacist decide what is drawn and how.
How to draw up medication from a vial is a question about a clinical task: using a sterile syringe and needle to pass through a vial’s rubber stopper and withdraw liquid. Because the task is performed on prescription medicines, the right instructions are the ones written for your specific product and given to you by your care team. What can be explained safely in general terms is what the supplies are and the aseptic rules the US Centers for Disease Control and Prevention (CDC) publishes for vials.
What you need
Supplies named by the CDC and in common patient care sheets are a vial, a new sterile syringe and needle, and a clean preparation area; a sharps container is used for the used needle. Background on each item:
- What is a hypodermic needle: the needle that pierces the vial stopper.
- What is a vial adapter: a separate accessory some products use instead of a needle.
- What is a filter needle: a different needle type used only where a product’s instructions call for one.
- Vial sizes: explains the container.
- Do syringes expire: covers the syringe date.
Single-dose and multi-dose vials: which do you have?
| Vial type | CDC rule (clinical safety page, March 26, 2024) |
|---|---|
| Single-dose | Approved for use in a single patient for a single case, procedure or injection. Do not combine (pool) or store leftover contents for later use. |
| Multi-dose | Approved for repeated uses. The vial should be dated and discarded within 28 days unless the manufacturer states another date. Assign multi-dose vials to a single patient whenever possible. |
Safety rules the CDC publishes for vials
| Topic | CDC rule |
|---|---|
| Syringe and needle | Use a new sterile syringe and needle for each patient. |
| Needle left in the vial | Do not leave a needle inserted into a medication vial septum for multiple uses. |
| Doubtful sterility | Always discard medication vials whenever sterility is compromised or questionable. |
| Work area | Draw up medications in a designated clean medication preparation area. |
What can go wrong
- Sterility is in doubt. The CDC rule is to discard the vial.
- Leftover medication. For a single-dose vial, the CDC says not to pool or store leftovers for later use.
- Reuse. A needle left in a vial or a syringe reused between patients breaks the CDC rules above.
- Medication mistakes. Errors are a recognised safety topic; see types of medication errors.
When to get professional help
Ask your prescriber, nurse or pharmacist if instructions are unclear or if a product needs mixing and you have not been shown how. For an emergency, use your local emergency number. For general product background on diluents, see bacteriostatic water vs reconstitution solution.
FAQ
Can a needle or syringe be reused on the same vial?
The CDC says to use a new sterile syringe and needle for each patient and not to leave a needle in a vial’s septum for multiple uses. Follow the instructions given for your own medication.
How long can an opened multi-dose vial be kept?
The CDC says a multi-dose vial should be dated and discarded within 28 days unless the manufacturer states another date. Single-dose vials are for one use only; leftovers are not stored.
Where do I find step-by-step instructions?
From your care team and the manufacturer’s instructions for your medication. Hospitals also publish patient care sheets, such as those listed under Sources.
Sources
Checked 2026-11-04.
- CDC, Injection Safety: Clinical Safety for Healthcare Providers (page dated March 26, 2024): https://www.cdc.gov/injection-safety/hcp/clinical-safety/index.html
- St. Jude Children’s Research Hospital, How to withdraw medicine from a vial (patient care sheet): https://together.stjude.org/en-us/medical-care/medication-management/how-to-withdraw-medicine-from-a-vial.html
- UF Health, Drawing medicine out of a vial (patient care sheet): https://ufhealth.org/care-sheets/drawing-medicine-out-of-a-vial
