Shenzhen police, in collaboration with the city's food and drug and quality inspection watchdogs, raided the Shenzhen Jinshuibao Biotech Firm on Thursday after they received customer's complaints of fake drugs on the market.

They also found seven fake official seals including one of the Guangdong provincial food and drug administration and the provincial disease control and prevention center, a spokesman with the Nanshan branch of the Shenzhen municipal public security bureau said on Saturday.

The fake Viagra tablets alone involved more than 9 million yuan (1.15 million U.S. dollars), he said.

Police have detained the legal representative and general manager of the firm.

The Ministry of Public Security said earlier this week that China has seized more than a ton of fake drugs for impotence, bird flu and malaria during the past two years of crackdown.