About Us

The Greenleaf Medical Clinic was founded in 2011 and assesses patients across Canada for their eligibility into Health Canada's Access to Cannabis for Medical Purposes Regulations (ACMPR) program.

The ACMPR provides a legal framework for patients to legally use marihuana for beneficial relief of various symptoms.

Our physician's role is to assess patient eligibility through chart review and/or discussions with the patients' primary care physician or specialist(s). When deemed eligible, an appointment is scheduled for either an on-site consultation or a tele-medicine appointment through VSee. Tele-medicine consultations accommodate patients that cannot travel to our clinic due to illness or distance. Tele-Medicine allows patients across the country to benefit from our services that are otherwise unavailable. In either case, the physician will complete the required medical document authorizing the patient to use cannabis as medicine.

Following the patient/physician consultation, the patient will work with one of the clinic's medical office assistants to decide on the licensed commercial producer that best suits their requirements. Strains will be recommended as per the physicians chart notes and past patient experiences.

Please note the clinic does not provide medication, as we are not a compassion club or a dispensary. The only legal source of medication for patients is to access their medical marihuana from one of Health Canada's licensed commercial producers. For a complete list of producers or more information regarding the Health Canada ACMPR program, please visit MedicalMarijuana.ca.

The Greenleaf Medical Clinic takes patient care to the next level!

After the patients’ appointment is complete and our doctor has completed the appropriate assessment and issued the required medical document to possess medical marijuana, our trained staff will then meet one-on-one with each patient.

This additional client service includes:

  •  demonstrations of how to properly use vaporizers
  • suggestions on other methods to safely consume marijuana
  • profiling the patients medical condition with specific marijuana strains
  • educating the patient on the current licensed producers and their product offerings

The GreenLeaf Medical Clinic ONLY makes recommendations of appropriate strains specific for the patients’ medical condition and educates them to what is available. The choice of licensed producer is solely that of the patient.


Dr. Caroline MacCallum

FRCPC (Internal medicine), BSc Pharm

Clinical Instructor, Faculty of Medicine, UBC  

Internist, VGH Dept Hematology/BMT & UBC Hospital

Medical Director, Greenleaf Medical Clinic

Special Interest in Complex Pain and Cannabinoid Medicine


Dr. MacCallum completed her undergraduate degree in pharmacy and medicine at Memorial University of Newfoundland , where she was born and raised. She graduated from the University of British Columbia Internal Medicine Residency Program in 2013. 

Upon graduation, Dr. MacCallum, practised Pain & Addiction Medicine at Vancouver General Hospital and Heartwood Addiction Program at BC Women’s Hospital. In addition she also practised complex pain medicine at the CHANGEpain Clinic and BC Women’s Complex Chronic Disease Program. 

Currently she is a clinical instructor in the Department of Medicine at UBC where she provides inpatient care on the Internal Medicine Ward at UBC Hospital and Bone Marrow Transplant Ward at VGH. She is also a guest lecturer and preceptor for UBC Faculty of Pharmaceutical Sciences Program. 

She is also the Medical director at Greenleaf Medical Clinic; a cannabis clinic in Langley, British Columbia which assesses patients’ suitability for therapy with legal, Health Canada approved medical cannabis. Greenleaf also offers group medical visits to provide patients with additional tools to manage their complex pain including; pain neurosciences, therapeutic movement, meditation, sleep, nutrition and medicinal cannabis groups. 

Dr. MacCallum has a passion for cannabis education and has done a number of CME presentations and preceptorships for physicians, pharmacists, nurses and other allied health care professionals. Her research interest include: cannabis as a multimodal therapeutic for the treatment of concurrent medical conditions and symptom clusters (pain, mood, anxiety, insomnia); safe use of medical cannabis to improved function and quality of life; cannabis to help taper prescription medications (opioids, benzodiazepines etc) to reduce overall polypharmacy burden; cannabis product safety (standardization, testing, and contaminants), cannabis and public health and safety including: cannabis impairment and cannabis use in the workplace.