LOS ANGELES (CBSLA) — Drug Enforcement Administration officials say counterfeit prescription pills from Mexico contain a lethal dose of fentanyl.

(credit: DEA)

The light blue tablets are stamped with an M on one side. The other side of the innocuous-looking tablets are stamped with a “30” and line that bisects the pill. The DEA says they are being manufactured in mass quantities by Mexican drug cartels.

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DEA officials say they have determined 27 percent of the tablets seized nationwide during just the first quarter of this year contain potentially lethal doses of fentanyl.

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A lethal dose of fentanyl is estimated to be about two milligrams, but can change depending on a person’s body size, tolerance and previous usage. Fentanyl has been involved in more deaths than any other illicit drug, according to the DEA.

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(credit: DEA)

“Counterfeit prescription pills and overdose deaths do not discriminate and they impact every community within every demographic,” DEA Special Agent-In-Charge William D. Bodner said in a statement. “These counterfeit pills are extremely dangerous and often times the user is unaware of how lethal they are and what’s inside them.”