I am newly diagnosed with MS (7/12), just finished 2nd month of Copaxone.... I can't tell you about the scientific issues, but the amount of fluid you inject is tiny! The syringe is VERY small!
I still get localized site reactions (some SHORT -TERM burning, then swelling, redness and itching (like I used to react to mosquito bites as a kid)... but it's been very manageable!
Good luck! Stay well! Judi