當受到性刺激時,陰莖血管的內皮細胞便會釋放出一氧化氮(NO),而此種因數會使得平滑肌細胞中的GMP轉變成 cGMP,進而使得平滑肌鬆弛、血管擴張、陰莖海綿體充血,最後導致陰莖勃起。當性刺激消失時,血液中的一種特殊的酵素(PDE)便會將cGMP加以分解,cGMP不見了以後,血管就會恢復正常,陰莖海綿體血液流回靜脈,陰莖也就回復原先的狀態。必須注意的一點是,要有一定程度的性刺激,服用藥物才具療效。這兩種壯陽藥都是屬於「第五型磷酸二脂酶抑制劑」(PDE5),可使平滑肌鬆弛,造成陰莖動脈擴張、血流量增加而導致陰莖勃起。
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