I have never used Copaxone. I was initially on Rebif. I switched to taking Statins, and am now on 80mg/day of oral Lipitor (a very common cholesterol drug).
The first time I took Lipitor, I think I actually noticed a reduction in the tingling in my feet within a few hours. It made the switch very easy for me.
You may also wish to read through the other forums, as people have had success with other approaches such as ABX's, LDN and supplements etc etc.