Does thiotepa expire?
The printed date covers the sealed pack. Once thiotepa is opened, mixed or diluted, its label sets a second and usually much shorter limit — quoted below, per product.
Shortest limit on any thiotepa label: 4 hours
“L After dilution the product is stable for 24 hours when stored at 2°C to 8°C (36° to 46°F) and for 4 hours when stored at 25°C (77°F).”
That applies to the product it is printed on, not to every form of thiotepa — check which one you have against the list below.
What the labels say
“L After dilution the product is stable for 24 hours when stored at 2°C to 8°C (36° to 46°F) and for 4 hours when stored at 25°C (77°F).”
On the label for Thiotepa · DailyMed
“L After dilution the product is stable for 24 hours when stored at 2° to 8°C (36° to 46°F) and for 4 hours when stored at 25°C (77°F).”
On the label for Thiotepa · DailyMed
“When reconstituted with sterile water for injection, solutions of thiotepa should be stored in a refrigerator and used within 8 hours.”
On the label for Thiotepa · DailyMed
“If not used immediately after reconstitution, the product is stable for 8 hours when stored at 2°C to 8°C (36° to 46°F).”
On the label for Thiotepa · DailyMed
“If not used immediately after reconstitution, the product is stable for 8 hours when stored at 2° to 8°C (36° to 46°F).”
On the label for Thiotepa · DailyMed
How the label says to keep thiotepa
Storage is the other half of the question: the stability behind any date assumes these conditions, and a medicine kept outside them ages faster than the calendar says.
- “Conditions Store refrigerated between 2° to 8°C (36° to 46°F).”
- “Protect from light.”
- “If not used immediately, store the reconstituted solution in the vial refrigerated at 2°C to 8°C (36°F to 46°F), for up to 80 hours.”
- “If the diluted solution is not used immediately, store refrigerated at 2°C to 8°C (36°F to 46°F) for up to 48 hours or room temperature at 25°C (77°F) for up to 6 hours.”
Frequently asked questions
Does thiotepa expire?
Two different clocks apply and only one of them is the printed date. The date on a sealed pack is the manufacturer's guarantee for the unopened product. Once it is opened, mixed or diluted, the label imposes its own limit — as tight as 4 hours on some thiotepa products, and that is the number quoted on this page.
Can I still use thiotepa after the date on the box?
This page cannot tell you that, and nor can any page. The FDA's own shelf-life programme found 88% of tested lots stayed within specification at least a year past expiry — and concluded in the same breath that lot-to-lot variation means this can only be confirmed by testing each lot. What you can check at home is the in-use limit above and whether the product has been stored as the label requires. Ask a pharmacist about a specific pack; they will also dispose of what you no longer need.
Why do different thiotepa products have different limits?
Because they are different formulations. A suspension that gets mixed with water, a pen that gets carried at room temperature, and a sealed tablet do not behave alike, so each manufacturer's label sets its own limit and each is shown here with the product it belongs to. We never merge them into one number for the molecule.
More on thiotepa
Quoted from FDA labels for reference, not medical advice, and not a suggestion to use anything past its limit. If you are unsure whether a pack is still good, a pharmacist can tell you and can dispose of it safely.