The purpose of this study is to investigate the effectiveness of L-carnitine treatment in patients with dodementia stage chronic cerebral ischemia. In parallel comparative clinical study included 60 patients (22 men and 38 women aged 42 to 74 years), the average age of the patients was 61.2±8.2 years. All patients received basic treatment, including antihypertensive and antiplatelet drugs. The first group consisted of 20 patients who received 1000 mg of L-carnitine per day (bilology supplement karniton). In the second group (20 patients), the drug was administered to 2000 mg per day. In the third (the control group) was carried out only basic therapy. The course of treatment was 60 days. After treatment significantly reduced the frequency of complaints of weakness, decreased performance, memory loss, headache, dizziness, unsteadiness of gait. Statistically significant differences after treatment revealed in the MMSE total score and subtests "focus" and "memory", compared to the baseline reduced the running time with all 5-tables in the test Schulte. According to questionnaire fatigue MFI-20 the main group level decreased overall, physical and mental asthenia, increased activity and the level of motivation. Revealed a dose-dependent effect of the drug.