s neuro considered Copaxone the weakest DMD, or what weakest means. It is a competely different drug from the other 3 DMDs, and its
mechanism of action is different.
Also, Rebif and Avonex are exactly the same drug, Interferon Beta-1a. Betaseron is similar but it is a little different, Interferon Beta-1b. I'm no doctor, so I can't explain all the differences, but its different formulation may be one reason for its higher rate of NABs.