Illegal online pharmacies are increasingly selling counterfeit pills made with fentanyl and methamphetamine to unsuspecting customers, the U.S. Drug Enforcement Administration said.

This week, the Centers for Disease Control and Prevention (CDC) issued a public health warning about prescription medications sold by online pharmacies. The public health agency said some online pharmacies could be selling prescription drugs tainted with the potent opioid fentanyl, which can be deadly.

The DEA’s most recent National Drug Threat Assessment found the purity level of illicit fentanyl in the U.S. drug market has increased and the amount of fentanyl found in counterfeit prescription pills has increased, making the nation’s top drug threat even more dangerous.

The online pharmacies are hurting legitimate national and local pharmacies like Lewis Drug…and they’re killing some people with unregulated counterfeit pills. Griffin says it’s critical to deal with legitimate companies.

In just a few clicks, you can find Adderall alternatives and popular weight loss drugs deeply discounted. Now, the CDC and the FDA are warning Americans about the risks of buying counterfeit prescription meds from online illegal pharmacies. "It's a big problem," said Sherri Cherman, PharmD, CEO and Founder of Elements Pharmacy in Studio City.

Federal prosecutors say a network of illegal drug sellers packaged potentially deadly synthetic opioids into pills disguised as common prescription drugs and sold millions of them through fake online drugstores.

The search for more affordable medications might cause people to access dangerous counterfeit drugs sold as genuine products by online pharmacies, the Centers for Disease Control and Prevention warned on Wednesday.

There's been a spike in illegal online pharmacies selling fake pills for Oxycodone, Adderral and Xanax and other drugs that actually contain the deadly dru

A federal agency is warning consumers about using illegal online pharmacies after an increase in sales of counterfeit pills made with fentanyl and methamphetamine. The warning comes after the death of one person who bought what she thought was oxycodone but died of fentanyl poisoning.