The burnout syndrome may affect academic achievement, but research on burnout and academic success of medical students is sparse. This research aimed to estimate the prevalence of high risk of burnout in students of medicine and to investigate its association with academic performance. It included 760 full-time medical students who completed the survey (response rate = 90.9 %). A significant independent predictor for high burnout risk in students with lower grade point average (GPA) was male gender (adjusted OR=2.44; 95 % CI=1.14-5.23; P=0.022). Among students with higher GPA, high burnout risk was associated with the use of sedatives (adjusted OR=6.44; 95 % CI=1.80-22.99; P=0.004).