What is the expiry date for Mekinist (trametinib) and when does it start?
Mekinist (trametinib) has an expiry date printed on the medicine pack. The expiry date is the date beyond which the manufacturer says the medicine should not be used. That date does not “start” at a specific time after you buy it; it is fixed when the medicine is produced and labeled on the package.
Where to find the exact expiry date on your box or bottle
Look on the carton or on the bottle/label for text such as “EXP” followed by a month and year (for example, “EXP 12/2026”). Use that printed date as the only authoritative expiry for your specific product.
Does expiry change once the medicine is opened or started?
The expiry date on the label still applies. Some products also note a separate “use within X days after opening” instruction, but that depends on the specific formulation and packaging. If your pack includes any “after first opening” instruction, follow that alongside the printed expiry date.
How does expiry relate to scheduled dosing (for patients restarting treatment)?
If you are continuing dosing and you reach the expiry date printed on your pack, you should not use that supply past the expiry date. Contact your prescriber or pharmacist to get a replacement before treatment is interrupted.
What happens if you accidentally use Mekinist past its expiry?
Using medicine after its expiry can reduce reliability and safety because the active ingredient may degrade. If you took a dose that was slightly past expiry, the next step is to ask a pharmacist for advice based on how far past the date it was and your situation.
If you tell me your pack details, I can help interpret them
If you share the exact text next to “EXP” (month/year) and whether it’s a tablet bottle or a blister pack, I can help you interpret what date you should stop using it.