名詞: n.
Viagra is an oral medicine used for treating male impotence (e.g., erectile dysfunction).
Viagra's advantages are a great safety track record and proven side effects.
It's effect starts in 30 minutes to 1 hour and lasts for about 4 hours.

資料來源：http://peaknoble.com/item.php?id=188
Canadian Pharmacy

詞條貢獻者： yeh.williamyt@inventec.com  
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