威而鋼 (Viagra) 是全球第一款勃起功能障碍治療藥品,為美國輝瑞大藥廠於90年代發明製造,其主要成分是西地那非 (Sildenafil)。當初輝瑞藥廠的研究人員是意外發現威而鋼能治陽痿障礙,原先製藥的目標是用來治療心絞痛。威而鋼對於勃起功能障礙和早洩這些症狀有非常顯著的改善。
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