George Doodnaught was convicted in November of kissing, fondling and forcing oral sex on the patients at North York General Hospital in Toronto during a four-year period that ended in 2010.
The victims were aware of what was happening but could not move, the court heard.
In delivering the sentence, Ontario Superior Court Judge David McCombs called the crimes "shocking and abhorrent," according to public broadcaster CBC.
"His conduct did enormous damage and was reprehensible in the extreme," it quoted McCombs as saying.
A researcher confirmed in court that the drugs can cause hallucinations.
But he added it was unlikely that all of the women, who did not know each other, would come forward separately with similar accusations against the same doctor.
The prosecution said Doodnaught was an experienced doctor who knew the routines of a busy operating room, and timed the brief assaults to avoid detection.
"He relied on the amnesiac effects of the drugs to shield him from complaints.
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