virility drug (trade name Viagra) used to treat erectile dysfunction in men
sildenafil的用法和樣例：
例句
He said sildenafil worked at least as well as melatonin, a jet-lag treatment. 他還認為昔多芬的作用至少和目前用於治療時差綜合症的退黑激素的作用類似。
In the study, researchers administered small doses of sildenafil to hamsters before adjusting the cycles of light and dark they lied in. 在這項研究中，研究者在調整倉鼠所處環境的白晝規律前，給其小劑量的昔多芬。
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