The owner of a Hamilton methadone clinic is accused of "disgraceful" and "unprofessional" conduct.
Dr. Michael Varenbut is facing a 10-day hearing before the College of Physicians and Surgeons of Ontario.
The doctor is the founder of Ontario Addiction Treatment Centres.
He owns 50 methadone clinics including one at 397 Main Street East.
The College of Physicians and Surgeons says the hearing will deal with allegations that Varenbut "failed to maintain the standard of practice of the profession" and that he "engaged in disgraceful, dishonourable or unprofessional conduct in relation to his treatment of and dealings with a patient."
If found guilty, he could lose his certificate or face a fine of up to $35,000.