Sales of the erectile-dysfunction drug sildenafil have been booming in China, but that development came as news to the manufacturer, Pfizer. Chronicle Monday, a drug-marketing newsletter, reports that almost all sildenafil being sold under prescription in Shanghai is fake. According to the Shanghai Evening Post, 2000 retail outlets are selling an average of 4 tablets a day, but Pfizer has distributed only 12 000 tablets in the entire country. The newspaper says the pills, which are supposed to retail for $22, are being sold for $90 at some drugstores in Shanghai.
. 2001 Feb 20;164(4):533.