枸橼酸西地那非是一种药物，化学名称是1-[4-乙氧基-3-[5-(6,7-二氢-1-甲基-7-氧代-3-丙基-1H-吡唑并[4,3d]嘧啶)]苯磺酰]-4-甲基哌嗪枸橼酸盐，为白色粉末。
该公司最为著名的药物要数万艾可。
有项高海拔自行车赛的试验，应用血管扩张剂以后(万艾可的化学名)，运动员每6公里可以缩短15%的时间。
A study of cyclists who took sildenafil citrate (the chemical name for Viagra) while racing at altitude found that it reduced their time over 6km by 15 per cent.
1998年，辉瑞公司发明了万艾可，其市场部高级主管吉姆·马费佐利说：“我认为，万艾可和e.”d .一起，已经成为文化构架中的一部分。
"Viagra, and I think E.D. along with it, have become part of the cultural fabric," said Jim Maffezzoli, a senior director in marketing at Pfizer, which introduced the drug in 1998.
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