Aldose reductase inhibitors

PROBLEM TO BE SOLVED: To provide a safe and effective aldose reductase inhibitor preventing several kinds of complications of diabetes. SOLUTION: This aldose reductase inhibitor is obtained by formulating the extract of one or more of the aboveground parts of Filipendula ulmaria, the flowers and stems of Ilex paraguarienesis and Arnica montana, the aboveground parts of Allium schoenoprasum, the leaves of Pimenta dioicalis, Rubus suavissims S. Lee and Psidium guayava, the aboveground parts of lagerstroemia speciosa and the flowers and stems of Tanacetum vulgare.