| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject therapeutic agent derived from a natural plant having a high biological safety, economic efficiency and excellently inhibitory action on activity of aldose reductase, effective for a diabetic peripheral nerve damage such as cataract, etc., by making the therapeutic agent include powder and/or an extract of a plant of the genus Rhodiola as an active ingredient. SOLUTION: This therapeutic agent contains powder and/or an extract preferably using the whole plant of a plant of the genus Rhodiola being preferably Rhodiola sacra as an active ingredient. The dose of the therapeutic agent is preferably 2-3 g per time in powder of Rhodiola sacra and 800-1,500 mg in water extracted essence or alcohol extracted essence as an effective amount for an ordinary adult and the therapeutic agent is administered three times daily. The powder is prepared, for example, by grinding Rhodiola sacra by a common grinder into a granular state of preferably about 100-150 meshes. The extract is prepared, for example, by extracting 1 kg powder of Rhodiola sacra with preferably 3-5 L of a solvent such as water, etc., under heating, etc., filtering and concentrating the filtrate under reduced pressure.
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