Federal prosecutors allege three doctors at a now-defunct clinic in Philadelphia that specialized in helping drug addicts actually sold them $5 million worth of prescription drugs.

According to a federal indictment released Wednesday, the doctors sold prescriptions for controlled substances to drug dealers and addicts for cash while performing little or no treatment as required by law.

The indictment says nearly 1,000 patients visited the National Association for Substance Abuse-Prevention Treatment clinic each month.

Seventy-eighty-year-old Dr. Alan Summers, 63-year-old Dr. Azad Khan and 79-year-old Dr. Keyhosrow Parsia are charged with distribution of controlled substances, conspiracy to distribute controlled substance, health-care fraud and money laundering.

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Summers attorney tells The Philadelphia Inquirer the treatment was “completely appropriate.”

It’s not known if Khan and Parsia have lawyers who could comment on the indictment.