Asthenia is a key symptom of posttraumatic disorders (postcommotion syndrom). The dynamics of the symptom developing after mild cranio-cerebral trauma was studied during the treatment of 36 patients with enerion (20 patients) and piracetam (16 patients - control group). The authors present the results of the complex study, which includes neuropsychological tests and scales. It was shown that enerion was more effective as compared with paracetam.