Chinese authorities are investigating two liquor distillers suspected of adding impotence treatment drug Viagra to their liquor.

In the latest in a series of China food-safety scares, the Liuzhou Food and Drug Administration said that it had found the Guikun Alcohol Plant and the Deshun Alcohol Plant in Guangxi's Liuzhou city were putting Sildenafil ( Viagra) into three of their baijiu products, Fox News reports.

Baijiu is a high-end grain liquor.

Authorities have confiscated 5,357 bottles of the suspect products and a batch of white powder labeled Sildenafil, according to a statement posted by the Liuzhou Food and Drug Administration on its Website.

The products were marketed as having health-preserving qualities, it said.