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Vardenafil

伐地那非
Mechanism of action:
Vardenafil 是一種第 5 型磷酸二酯酶抑制劑(phosphodiesterase type 5 inhibitor)。第 5 型磷酸二酯酶(phosphodiesterase type 5)是負責分解環磷酸鳥苷(cGMP)的酵素,在陰莖海綿體與肺血管平滑肌中特別豐富。Vardenafil 可選擇性抑制此酵素,減少 cGMP 的降解。cGMP 會活化蛋白激酶 G(protein kinase G),使細胞內鈣離子濃度下降,海綿體與血管平滑肌放鬆,血流量增加。
Reference(s):
1. Forstermann U et al. (2012). Nitric oxide synthases: regulation and function. Eur Heart J.
2. Jing ZC et al. (2011). Vardenafil in pulmonary arterial hypertension: a randomized, double-blind, placebo-controlled study. Am J Respir Crit Care Med.
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