HARRISBURG, Pa. (AP) — A Pennsylvania doctor who recently prescribed nearly 3 million doses of opioids during a 19-month period has been charged with causing the overdose deaths of five people, federal prosecutors divulged on Thursday.

The U.S. attorney’s office in Harrisburg said that Dr. Raymond Kraynak, 60, of Mount Carmel, was indicted on five counts of drug delivery resulting in death, 12 counts of unlawful distribution of a controlled substance and two counts of using his doctor’s offices as “drug-involved premises.”

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He is charged with prescribing, without a medical purpose, 3,622,598 oxycodone pills from May 2012 through Jan. 31, 2016, and 2,792,490 doses of oxycodone, hydrocodone, OxyContin, and fentanyl to 2,838 patients from Jan. 1, 2016, to this past July 31.

Prosecutors claimed that a state monitoring program identified Kraynak as having issued the most opioid prescriptions of any physician in Pennsylvania over the 19 months that ended in July.

Authorities did not disclose the names of the five patients but said they had died between 2013 and 2015.

Kraynak’s federal public defender said his client hopes to be released on bail so he can continue to help his patients obtain treatment.

“At this point, we haven’t received any discovery, so I really don’t know exactly what’s going on here,” said the defense lawyer, Tom Thornton. “Our greatest concern is for Dr. Kraynak’s patients who still need treatment, they need care.”

The U.S. attorney’s office said Kraynak prescribed about 2.8 million dosage units of opioids to about 2,800 patients over the 19-month period. He is accused of issuing prescriptions without conducting prior and thorough medical examinations, verifying his patients’ medical problems or assessing their risk of drug abuse.

“There’s a human cost to this and there are people out there who have been prescribed hundreds and hundreds of pills over time,” said U.S. Attorney Dave Freed at the news conference to announce the charges.

Freed said he was disappointed by the nature of the allegations, given the national opioid addiction crisis. He referred to the volume of pills Kraynak is alleged to have prescribed “staggering.”

“Nobody can deny that the crisis is in the public domain, and physicians certainly know that,” Freed said.

If Kraynak is convicted, the five charges of causing the patients’ death s each carry a mandatory minimum sentence of 20 years. Thornton said those charges are most often filed in the cases of accused heroin dealers.

Federal prosecutors are seeking forfeiture of Kraynak’s medical offices in Mount Carmel and Shamokin.

The Northumberland County doctor accused of illegally prescribing millions of doses of opioids has lost his ability to practice medicine.

The State Board of Osteopathic Medicine Tuesday suspended temporarily the license of Dr. Raymond J. Kraynak, 60, finding he is “an immediate and clear danger” to public health and safety.

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