In an open-label study, 12 patients with refractory MG or who were taking o
nly corticosteroids and required additional immunosuppression received myco
phenolate mofetil 1 g twice daily for 6 months. A reduction of three points
in a quantified MG score and two points in a manual muscle test or a reduc
tion of 50% in corticosteroid dose defined efficacy. Eight patients improve
d, beginning after 2 weeks to 2 months. No major side effects were observed
.