Tubocurarine is a kind of NMB.It is the first typical non-depolarizing muscle relaxant in clinical application.Excreted unchanged in kidneys and biliary system. Side effects:Histamine release from mast cells.A higher dose may eventually paralyze the diaphragm and cause the patient to stop breathing.NotesNot be used in patients with myasthenia gravis.There is a risk of paralysis of respiratory muscles, so the first aid medical equipment should be prepared before application.