The Mount Sinai doctor accused of sexually assaulting a drugged emergency-room patient, plied her with propofol — the dangerous sedative that killed Michael Jackson — prosecutors said on Thursday.

Dr. David Newman, 45, previously told cops he thought he gave the victim morphine after she complained of shoulder pain.

But prosecutors said tests of the 22-year-old victim’s urine showed she had propofol in her system. The drug is used to relax a patient before and during general anesthesia.

“It was this drug, propofol, that the defendant administered to the complainant,” said prosecutor Eun-Ha Kim during a brief hearing in Manhattan Supreme Court.

“This drug is not a controlled substance and because of that, defendant had greater access to it in the ER.”

Kim said after Newman gave the woman the drug, he masturbated and then ejaculated on her face.

Lawyers for the accused dirty doc, who looked glum as he left the courtroom, had no comment on the new revelation.

During questioning on Jan. 12 at his Montclair, NJ, home, Newman gave cops a bizarre explanation of the disgusting act.

“I am embarrassed because I whacked off in the lounge, and it was possible that the ejaculate may have gone from my hands to the woman’s blanket,” he said. “Semen may have also transferred from my hand to her face during the time I treated her.”

Sources previously told The Post that the woman regained consciousness but remained helpless during the attack, afterward saving a DNA sample and alerting other doctors before leaving the hospital.

Prosecutors said sperm was found on the victim’s eye and Newman’s DNA was recovered from her face. She filed suit against him and the hospital, which suspended him.

Since his arrest in January, three more women ranging in age from 18 to 21, have come forward to accuse Newman of groping their breasts during trips to the ER.

Pop star Jackson, who used propofol to help him sleep, fatally overdosed on the powerful sedative in 2009. His doctor, who administered the drug, was convicted of involuntary manslaughter.

Newman turned himself in to police Jan. 19 and is charged with five counts of sexual abuse. Prosecutors previously offered him four years in prison on the top count, which he declined.