It is used to stop or lower the harshness of other infections in people with a weak immune system. It is used to treat immune thrombocytopenia (ITP). It is used treat chronic inflammatory demyelinating polyneuropathy (CIDP). It is used to stop or lower the harshness of infection by hepatitis A, measles, chickenpox (varicella), and rubella. It is used to treat multifocal muscle neuropathy. It is used to treat Kawasaki disease. It may be given to you for other reasons. Talk with the doctor.