Viagra is an effective drug for treating erectile dysfunction in men. Its English name is Sildenafil (translation: sildenafil, sildenafil, sildenafil), its trade name is Viagra (translation: Viagra, Viagra), and the prescription drug in my country is Viagra. 1 Sildenafil Citrate, trade name: Viagra, is the world's first oral drug for the treatment of erectile dysfunction (ED) developed by Pfizer. 2. Launched in the United States in March 1998, the word Viagra first spread in Hong Kong and then entered the mainland. In July 2000, Viagra was approved to be marketed as a prescription drug in China, and the name was determined to be Viagra. In September 2001, the State Intellectual Property Office approved the patent right for use in China, and in May 2004, it was approved for retail sale in pharmacies. 3 Under media reports, the term Viagra has been generalized from referring specifically to Pfizer's "Viagra" to an industry term, "a drug for treating sexual dysfunction." 3 American Pfizer Co., Ltd. and Guangzhou Wellman Pharmaceutical Co., Ltd. have engaged in multiple civil and administrative lawsuits regarding disputes related to the "Viagra" trademark. In the end, Guangzhou Wellman Pharmaceutical Co., Ltd. obtained the "Viagra" trademark No. 1911818.