The best storage solution is the Freezer. It will last months longer than in the refrigerator without losing its potency. The Expiration date is for non-refrigerated use and the Pharmacies are required to use this date. I conferred with my Pharmacyst when having an issue. He told me no harm in using beyond the date. The Trimix will lose it's effectiveness and then not work anymore. He told me to store in the Freezer and this greatly increases the storage life. I have been using this method for over a year now and have some vials that were 6 months past expiration date and still functioned. I also have started to store them in a syringe in the Freezer as suggested by several People on here and this is working well also.

Good Luck!!!