Preparations of Scutellaria baicalensis, namely its dry extract and the bioflavonoid baicalin stimulate erythropoiesis depressed in deprivation of the paradoxical phase of sleep. After a conflict situation, when hemopoiesis is activated, both drugs normalize it. The modulating effect of drugs on hemopoiesis in exposure to neurotic factors is a consequence of their influence on the functional state of the cell elements of the hemopoiesis-inducing microenvironment. The capacity of the Scutellaria baicalensis drugs for reducing the effect of psychoemotional stress on the blood system is apparently related to their influence on the adrenergic structures.