tramadol 338338 (50.6%). Ear and labyrinth disorders. Verto. 3 (1.4%). 3 (1.0%). 8 (1.5%). 27 (2.5%). 3 (0.4%). Gastrointestinal disorders. Abdominal pain.tramadol, 1.6% 89 mg tramadol). There were no serious AEs. Unclear risk 338–50. 10.1111j.1464