BEIJING, January 22 (Xinhuanet) -- A warning was issued recently by health and pharmaceutical officials in east China's Shanghai Municipality to caution customers against fake anti-impotent medicine, Viagra, as CRI reports.
　　 The Shanghai Bureau of the Drug Administration and the Administration for Industry and Commerce issued the warning after spotting fake drugs in Shanghai sex health shops last month, Saturday's China Daily reported.
　　 The discovered counterfeit products have the exact same shape, color and packaging as Wan Ai Ke, the Chinese brand name for Viagra, which was launched as a prescription medicine in China with approval from the State Drug Administration last September.
　　 According to reports by the Shanghai Evening Post and the ebsite "eastday.com.cn", about 90 percent of Viagra sold in Shanghai is not real.
　　 Another article in Shanghai's Xinmin Evening News said that in the past few months the city's health bureau inspected 197 sex health product distributors and discovered dozens of items with forged approval numbers.
　　 Pfizer, the blue pill's manufacturer, expressed its willingness to cooperate with the government departments in a nation-wide anti- counterfeit campaign in order to ensure the safety of patients.
　　 Shanghai health officials said that as a prescription drug, Viagra should only be used in hospitals.
　　 Sources said that Shanghai Pharmacy Co., Ltd and China Pharmacy Group Shanghai Company are the only two authorized Viagra suppliers for local hospitals.
　　 The maximum dosage of the drug is two pills a week. Viagra is sold in all hospitals in Shanghai at an officially set price of 100 yuan (approximately 12 US dollars).

　　From Xinhua News Agency