Maleic acid Chlorphenamine Maleate is H1 receptor blocking agent which can repress the expansion of microhemopipets caused by histamine and increase the permeability of capiilary vessels.

• 氢溴酸右美沙芬力镇咳药，通过抑制延髓咳嗽中枢产生镇咳作用；马来酸氯苯那敏为H1受体阻断药，可对抗组胺引起的微血管扩张和毛细血管通透往增加。