[Therapeutic algorithm].

Therapeutic algorism for myasthenia gravis (MG) and myasthenic syndrome are described. For adult MG patients, thymectomy is basically recommended as an essential therapy. However, drug therapy or surgical treatment may be chosen for child MG patients depending on their age of onset. As for Lambert-Eaton myasthenic syndrome (LEMS), lung cancer and other malignancy may be treated first especially in male patients, and then drug therapy may be considered.