Copaxone, Rebif, Avonex, and Betaseron. Other medications are used (like the Solu-Medrol) during attacks, and to help with symptoms (like Provigil for fatigue). There are other medications that are used when the CRAB drugs aren't working, but have risks and side effects (like Tysabri).
On this site, there's a lot of information about medication and treatment, relapses, and pseudo-relapses, etc. in the Health Pages (see upper right hand corner).