Viagra is the brand name of a medicine men take for erection problems — when the penis will not become or stay hard enough for sex. It is a small blue tablet, and a doctor's prescription is needed for it. Because it was the first drug of its kind and was talked about everywhere in the news in the late 1990s, the brand name became the ordinary word: people say Viagra even when they mean any similar pill, in the same way people say 普拿疼 for any headache tablet.

Viagra Viagra is the brand name of a medicine men take for erection problems是男性用來治療勃起功能障礙的藥物商品名 — when the penis will not become or stay hard enough for sex也就是陰莖無法勃起或無法維持足夠硬度來進行性行為. It它 is a small blue tablet是一顆藍色小藥片, and a doctor's prescription is needed for it需要醫師處方才能取得. Because it was the first drug of its kind and was talked about everywhere in the news in the late 1990s因為它是同類藥物裡的第一個，在1990年代末的新聞裡到處都在講, the brand name became the ordinary word這個商品名就變成了一般人講的通用說法: people say Viagra even when they mean any similar pill大家會說Viagra，就算指的是任何類似的藥丸, in the same way people say 普拿疼 for any headache tablet就像大家會說普拿疼來指任何頭痛藥一樣.

Two things about the word matter for writing. First, it is a name, so it takes a capital V. Second, it is used very often in jokes and comparisons, not only in medical talk — a newspaper might call something "Viagra for the economy", meaning something that suddenly gives strength or energy back to a thing that had gone weak. That figurative use is common and usually a bit playful or rude.

Two things about the word matter for writing寫作上有兩件事要注意. First第一, it is a name這是個專有名詞, so it takes a capital V所以V要大寫. Second第二, it is used very often in jokes and comparisons, not only in medical talk這個字很常用在玩笑和比喻裡，不只用在醫療場合 — a newspaper might call something "Viagra for the economy"報紙可能會說『Viagra for the economy』, meaning something that suddenly gives strength or energy back to a thing that had gone weak意思是讓原本疲弱的東西突然恢復了力氣. That figurative use這種比喻用法 is common and usually a bit playful or rude很常見，通常帶點玩笑或有點粗俗.

In serious medical writing the drug's real chemical name is sildenafil, and doctors will use that. Socially the word is still slightly embarrassing to say out loud in Taiwan, so people often lower their voice or use the Chinese slang name.

In serious medical writing在正式的醫療文章裡 the drug's real chemical name is sildenafil這種藥真正的化學名稱是sildenafil（西地那非）, and doctors will use that醫生會用這個名稱. Socially在社交場合 the word is still slightly embarrassing to say out loud in Taiwan這個字在台灣講出口還是有點尷尬, so people often lower their voice or use the Chinese slang name所以大家常常會壓低聲音，或用中文的委婉說法.