A novel drug comprises as active ingredient an extract extractable from plant material of plants belonging to the genus Caesalpinia, one or several components of this extract and/or one or several substances present in this extract or derived therefrom but prepared synthetically. These substances are in particular benz(b)indeno(2.1-d)pyran derivatives, including brazilin, brazilein, hematoxylin and/or hematein. The drug is especially suited for treatment of a patient suffering from micro-circulatory disorders, diabetes mellitus, increased blood sugar values, increasing blood platelet aggregation, increased blood viscosity, decreased eryhtrocyte deformability, disorders of the lysosomal enzyme activity and/or suffering from disorders of the prostaglandin metabolism, especially increasing thromboxane A2 activity.
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