Mixed Caverject/Edex Shelf Life

[Irish Lad 34]

Caverject comes as a vial of powder + a tube of bacteriostatic water.

I assume most people mix the solution moments before injecting. I think this is how it's meant to be used.

I wonder: If you mix the solution - how long does it last before it's useless?

Like, can you keep a syringe of mixed solution in your pocket for a week?