Getting a job teaching in medical school is very unlikely unless you are a doctor and have practiced/are practicing in Canada. You can attempt to get a teaching job in biochemistry or medical biochemistry but not through the medical faculty. The portion of medical biochemistry in the medical curriculum is relatively short. Chances of getting a job will depend on your area of research, whether your research has been attracting a lot of funding, etc. Essentially universities are often looking for professors that will be able to bring prestige to the university through publishing and will be able to attract as much funding as possible. There are minimal jobs in academia compared to PhD students graduating from even Canadian firms so your previous experience in academia and what schools you attended will matter. It is a very tough job market. Would make sure you have a plan b. You can contact some school departments to see if there is any interest in your research and any jobs that will likely be opening up in the next 5 years. Not a lot of turnover in the type of job you are looking at. If you were a physician practicing and teaching it would be much easier to also teach as well and there is more turnover. Teaching commitments are usually just a block of time and not a full semester or year.
Easier to get a job in Academia in the US where there are so many schools. Many Canadians with PhDs go to other countries because there are more job opportunities especially in the US.