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一般的说,凡临床上用以抑止出血的药物都叫止血药,止血药的作用方式大致可分三类。其一是增进血管外的血液凝固性,形成血栓以堵塞出血点;其次是巩固血管壁以降低其渗透性;其三是收缩血管,以扎紧出血口。但是人体的出血,有内出血与外出血的区别,内出血如肺、胃、肠、肾等内脏出血,外出血如鼻衄、创伤等,在一般理论上,出血部位的血管收缩,应使出血停止,但是一般收缩血管的药物,对内脏血管的收缩,不如对皮肤血管收缩的强,而且全身血管收缩时,引起血压上升,反使内脏出血加剧,所以内脏出血不能使用收
In general, all drugs used to suppress bleeding in clinics are called hemostatic drugs. The mode of action of hemostatic drugs can be roughly divided into three categories. One is to increase blood coagulation outside the blood vessel, form a thrombus to plug the bleeding site; second is to consolidate the vessel wall to reduce its permeability; and third, to contract the blood vessel to tighten the bleeding port. However, the body’s bleeding, there is a difference between internal bleeding and external bleeding, internal bleeding such as lungs, stomach, intestines, kidneys and other internal organs bleeding, external hemorrhage such as epistaxis, trauma, etc., in general, blood vessels in the bleeding site contraction should stop the bleeding , but the general contraction of blood vessels of drugs, the contraction of splanchnic blood vessels, as the skin vasoconstriction is stronger, and the systemic vasoconstriction, caused by elevated blood pressure, anti-hemorrhage increased internal organs, so the visceral bleeding can not be used