The Justice Department (DOJ) charged two men with illegally importing from China counterfeit weight-loss products made with ingredients that could cause heart attacks. The two Chinese nationals, Sengyang Zhou and Qing Ming Hu, were arrested earlier this week, the DOJ said in a statement. Zhou was arrested in Hawaii and Hu was found in Plano, Texas.

The arrests happened after an unidentified man, who was originally taking the GlaxoSmithKline drug Alli, began suffering from headaches, chills and symptoms similar to a heart attack after taking a counterfeit version of Alli. The man said that he ordered the pills off of a Web site that sold a cheaper version of Alli. The DOJ said those were some of the pills Zhou allegedly counterfeited. Zhou and Hu imported several weight-loss products that they said were just cheaper versions of the government-approved medicines.

According to the complaint, Zhou admitted he made the counterfeit Alli. If charged he could face 20 years in prison and hundreds of thousands of dollars in fines. The accomplice, Hu, could face prison time and $250,000 in fines.