An open comparative clinical study evaluated the efficiency of Proproten-100 in reliving affective, somatovegetative, behavioral, and cognitive post-withdrawal disorders and manifestations of primary pathological alcohol addiction in patients with alcohol dependence in the stage of therapeutic remission. We compared the efficiency of Proproten-100 and standard symptomatic drugs. The preparation possessed anxiolytic, antidepressant, and vegetostabilizing properties, produced a moderate soporific effect, and had no sedative activity in patients with dysphoric depressions and psychopathic disorders. Proproten-100 was more effective during the therapy of patients with anxious and wistful depressions. Proproten-100 increased the contents of IgG and natural antibodies against S100 protein in the blood from patients. The preparation did not cause side effect or development of tolerance. Proproten-100 has psychotropic properties and holds much promise for long-term treatment of patients with alcohol dependence to reduce the incidence of recurrences.