As of October 17th 2018, the ACMPR is now consolidated as part of the Cannabis Regulations.
The Access to Cannabis for Medical Purposes (ACMPR) are the Government of Canada's regulations that enable patients to obtain authorization to access cannabis for medical purposes.
It's a mail order system that allows patients to sign up with a licensed producer, and legally purchase medical cannabis online in Canada.
Under the ACMPR, Doctors or Nurse Practitioners are responsible for authorizing patient access to medical cannabis.