After you first enter a multi-dose vial: refrigeration, the shortened beyond-use window, labeling the date, and clean re-entry. Not medical advice.
Key points
- 01First entry starts a beyond-use clock. The moment you first pierce the stopper, a multi-dose vial is on a shorter timeline than its unopened expiry. From then on, a beyond-use date, not the label date, governs when it should be discarded.
- 02Refrigerate between uses unless told otherwise. For most reconstituted peptides and many multi-dose products, refrigeration at 2 to 8 C between doses preserves the contents. Keep the vial off the freezing back wall so it cannot freeze.
- 03Label the date of first use. Write the date you first entered the vial directly on it. That single note is what lets you honor the beyond-use window; without it, you are guessing how long it has been open.
- 04Clean the stopper every single time. Swab the rubber with alcohol and let it dry before every re-entry, not just the first. Each puncture is a chance to introduce contamination, and the bacteriostatic agent only limits growth, it does not sterilize.
- 05Use a fresh needle for each draw. Do not leave a needle parked in the stopper between doses, and do not reuse a needle across draws. A fresh sharp for each entry keeps both the vial and the dose clean.
- 06Inspect before every dose and discard on doubt. Check for cloudiness, particles, or color change each time, and discard once you reach the beyond-use date even if solution remains. Our cloudy-solution guide covers what a bad vial looks like.
Frequently asked questions
How long is a multi-dose vial good after opening?+
Shorter than its unopened expiry. First entry starts a beyond-use window governed by the product and your storage, so label the open date and discard at the window's end even if solution remains. Not medical advice.
Do I refrigerate a multi-dose vial between uses?+
For most reconstituted peptides and many multi-dose products, yes, at 2 to 8 C, kept off the freezing back wall. Confirm the storage instruction for your specific product.
Can I leave the needle in the stopper between doses?+
No. Leaving a needle parked invites contamination and can let air or moisture in. Use a fresh needle for each draw and swab the stopper before every entry.
Why label the date of first use?+
Because the beyond-use window runs from first entry, not from the label date. The written open date is the only reliable way to know when the vial should be discarded.