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西地那非（ｓｉｌｄｅｎａｆｉｌ）是１９９７年３月经ＦＤＡ批准作为处方药在美国上市的治疗勃起功能障碍（ＥＤ）的药物。商品名为Ｖｉａｇｒａ，由辉瑞公司开发。结构式如下：本品在治疗心绞痛的Ｉ期临床时，发现有效性低但有促发阴茎勃起的副作用，故进一步经临床研究...
Sildenafil is a drug marketed in the United States as a prescription drug approved by the FDA in March 1997 to treat erectile dysfunction (ED). Trade name Viagra, developed by Pfizer. Structural formula is as follows: This product in the treatment of angina pectoris stage I clinical, found that the effectiveness of low but elicited penile erection side effects, so further clinical research ...