You need to definitely to look into that. I think most of OWPs get restrictions - you can look up online what restrictions there are exactly. One of the restrictions is medical field. That's what I've on my OWP. I think even if you sent the medical exam it would have come with such a restriction. I suppose people like teachers or doctors have to go through a Canadian approved course/training to obtain sort of a license to be able to perform such a job. It's just my guess and things that I overheard.
in her case, she has already done all of the relevant licensing exams, so she has almost all of the qualifications required to practice as a pharmacist here...outside of needing a few weeks of practical experience...which is what we were hoping the open work permit would help with....but now it seems that it may not be as useful as we thought...