Counterfeit pills related to reported overdoses in the Central Georgia area have been identified by the Georgia Bureau of Investigation's Crime Lab.

The pills contain a mixture of two synthetic opioids, cyclopropyl fentanyl and U-47700, an analysis by the lab confirmed.

GBI said U-47700 is a synthetic opioid that is 7.5 times stronger than morphine, while cyclopropyl fentanyl is a drug that is not intended for human or veterinary use. GBI said it is unknown how the body will react to the drug.

Georgia authorities believe up to four people have died and dozens more have become ill in the central part of the state after overdosing on the unknown street drug.

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The bureau said the drugs, which can be inhaled or absorbed through the skin, are extremely toxic, highly dangerous and should not be handled even in the smallest quantities.

A law banning the substances went into effect on April 17.

The Center for Disease Control and Prevention said about 1,300 people overdosed on drugs in Georgia last year.