Polyguinol is a kind of foam hardener made in China. It is through the principle of chemistry, can destroy the inner lining of the blood vessels, so that the blood vessels and surrounding tissues to form aseptic inflammation, through the human body to the absorption of aseptic inflammation, and will eventually form a fibrous strip, to close the lumen of the blood vessels to achieve the purpose. It is mainly through the polycinnamyl alcohol that this drug can act with the lining of the blood vessel wall, destroying the lining of the blood vessel, because it is a foam, so the drugs used will be less, the impact on the human body is relatively small, it can stabilize the concentration of the drug, increase the contact area with the blood vessel wall, and improve the action of the therapeutic efficacy. It is mainly used in the treatment of varicose veins.