Reserpine storage conditions (side population studies)

Dear Flowers,

I am wondering if anyone has used Reserpine powder from Sigma as a blocker for side population studies. I've tried searching for information regarding its storage conditions after reconstitution with DMSO but couldn't find much. If anyone has tried making the reserpine solution up and storing it, could you kindly share with me which temperature stores this solution best and for how long can i store it at this temperature and ensure that it still functions well as a blocker for side population studies.

Many thanks,

Pearly