I notice your question didn't get answered, sorry
I personally have used Trimix for a year with no problems, and it was still strong at the end. I figure as long as it is kept refrigerated, isn't cloudy or of altered appearance, I would use it. Not saying you can or should, just relaying my experience. Using Trimix a couple times a week and varying the injection site from left to right and moving around a little bit will go a long way to keep from having injection side effects.
James C, 64, East TN
Gonna Make Myself A Better Man tinyurl.com/28e8qcg
4/07: PSA 7.6, 7/07 Biopsy: 3 of 16 PCa, 5% inv, lf. lobe, GS6
9/07: Nerve Spar.
open RP, Path: pT2c, 110 gms., clear except:
Prob. microscopic inv.-left apical margin -GS6
3 Years: PSA's .04 each test until 4/10-.06, 9/10-.09, 12/10-.09, 2/11-.08, 5/11-.08