Phenolsulfonamide is a commonly used hemostatic drug to prevent post-operative bleeding, and can be administered intravenously or intramuscularly half an hour before surgery, and again two hours after surgery. Phenolsulfonamide has a capillary and platelet effect, enhancing capillary resistance, reducing permeability, and enhancing platelet aggregation and adhesion, resulting in rapid hemostasis and shortening clotting time. Phenylsulfonamide is used in combination with vitamin K, which promotes the formation of clotting factors, so the effect is more obvious when used together. Phenylsulfonamide is mostly used in patients with liver damage and poor liver function, because the metabolism of phenylsulfonamide is usually excreted through the kidneys.