uoafawxga

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威而鋼屬於磷酸二酯酶5型(PDE5)抑制劑。它通過抑制PDE5酶的作用,增加一種名為cGMP(環磷酸鸟苷)的信號分子的濃度。cGMP有助於放鬆陰莖海綿體內的血管,從而增加血液流入陰莖,促進勃起。威而鋼在性刺激的作用下能夠發揮效果,但它本身不會引起性慾或直接刺激陰莖。因此,服用威而鋼的男性需要在性刺激的幫助下才能實現勃起。

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