Inclusion Criteria:  Patients 18 and older. Patients must have prior or current documentation of MGFA MG grades 2, 3, or 4A generalized MG, according to the MGFA classification system. These grades correspond to mild (2), moderate (3), and severe (4). Patient's signs and symptoms should not be better explained by another disease process. Patients must be willing to complete the study and return for follow-up visits. Patients must be willing to give written informed consent before participating in this study. A copy of the signed consent must be kept in the patient's medical record. Patients can be on the following drugs as long as there has been no dose change for 60 days: azathioprine, cyclosporine, cyclophosphamide, mycophenolate mofetil, tacrolimus, methotrexate, IVIg or other immunosuppressive drugs. Patients can be on prednisone as long as there has been no dose change for 30 days. No planned changes in MG medications during the study  Exclusion Criteria:  MGFA grade V within 6 months of screening. A history of chronic degenerative, severe psychiatric, or neurologic disorder other than MG that can produce weakness or fatigue. Other major chronic or debilitating illnesses within six months prior to study entry. Female patients who are premenopausal and are: (a) pregnant on the basis of a serum pregnancy test, (b) breast-feeding, or (c) not using an effective method of double barrier (1 hormonal plus 1 barrier method or 2 simultaneous barrier methods) birth control (birth control pills, male condom, female condom, intrauterine device, Norplant, tubal ligation, or other sterilization procedures). Thymectomy in the previous three months. History of severe reactions to OAA Participation in a research study within the last 3 months