An Orange County, California, convict currently doing a 10-year federal prison stretch for health care fraud has been charged with distributing misbranded drugs called "Vitalex" that were marketed as "all-natural" versions of sexual enhancement drugs such as Viagra.

Phu Tan Luong, also known as Peter Luong, 55, and his daughter, Helene Ngoc Bich Luong, 26, were charged in a criminal information filed last week in United States District Court.

The criminal information contends that Luong and his daughter used a company called Vitapro, Inc. to deliver into interstate commerce misbranded drugs called Vitalex for men and Vitalex for women. The drugs were advertised and labeled as "herbal sexual enhancement supplements" and "all-natural" versions of Viagra, Cialis or Levitra.

However, these "supplements" actually contained an unregulated drug -- an Acetildenafil-analog -- which is similar to those found in brand-name erectile dysfunction drugs and which pose a serious health risk . The Luongs allegedly obtained the components of Vitalex from China and shipped the drugs from Orange County throughout the United States and to other countries.

Five years ago, Phu Tan Luong was convicted of 35 counts of health care fraud and five counts of money laundering in connection with a medical supply company he owned called United Medical Supply that submitted fraudulent claims to Medicare for enteral nutrition, motorized wheelchairs and hospital beds that were not medically necessary and, in many cases, never delivered.

He was sentenced to 10 years in federal prison for his role in the scheme that caused Medicare to suffer approximately $14 million in losses. Using money generated by the United Medical Supply scheme, Phu Tan Luong started Vitapro, and, with the help of his daughter, continued to run the business after he started his prison sentence in late 2006.

The Food and Drug Administration (FDA), armed with a search warrant in April 2008, seized a large amount of the Vitalex products and packaging from the Vitapro business and Luong family residence. While the FDA shut down the Vitapro business, Vitalex products continue to be sold over the Internet.

"The FDA-Office of Criminal Investigations is fully committed to investigating and supporting the prosecution of those who may endanger the public's health and safety by manufacturing and selling unsafe products to be used on an unsuspecting public," said Thomas Emerick, Special Agent in Charge, FDA-Office of Criminal Investigations, Los Angeles Field Office.

The Luongs are each charged with one count of delivery for introduction into interstate commerce of a misbranded drug, a misdemeanor offense that carries a statutory maximum sentence of one year in federal prison.

Helene Luong is believed to be in Canada. Phu Tan Luong, who is currently in a federal prison facility in Pecos, Texas, is expected to be returned to Southern California for an arraignment on June 7.

The world of sexual enhancement products can be fraught with danger. A major producer of such products recently announced it was expanding a recall after the FDA found many of them were unapproved.