However, if you get any of these symptoms you should contact a doctor urgently. • Abnormal laboratory liver test results • Multiple sclerosis, swelling of the spinal cord (myelitis) • Drooping eyelid and sagging muscles on one side of the face (facial palsy) • A temporary inflammation of the nerves, causing pain, weakness and paralysis in the extremities and often progressing to the chest and face (Guillain-Barré syndrome) • A disease of the nerves of the eye (optic neuritis)