Unfreezing trimix for use

[Kansasal]

I just purchased trimix for the first time. I got 5 vials with 1 ml each of trimix. My dosage to start is 15 units which the pharmacist calculated to be 6 doses per vial if I am optimistic and can stay at 15.
So the package says that it will keep for 45 days in the freezer but only three days in the refrigerator. Using math, this means that my wife and I have to have sex twice daily for the three days once I start a vial to use it all up. This doesn't seem right. So how can I draw the 15 units and put the vial back in the freezer for consumption at a later date? I plan to use the compound two or three times a week.
Also when do you inject yourself before penetration? Do you inject, then foreplay then penetration? Do you have foreplay first, then inject? What are some of your methods?

Thanks. I am waiting for Monday morning to try this so my doctor will be in his office in case of problems.