Gilenya (jill-LEN-nee-ya, fingolimod) is the first ORAL drug to reduce relapses in relapsing multiple sclerosis (MS)

Please see the May 2012 FDA safety communication concerning Gilenya

It's a new immune modulator that prevents some white blood cells from migrating to the CNS and damaging it.

Gilenya is approved for first-line use...but don't expect it to replace beta-interferons (Avonex, etc), or Copaxone (glatiramer). These drugs have a longer safety record and they're less expensive.