Applying While In A Post-Grad Degree

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I was recently speaking to a dentist who has been on some dentistry admissions committees in Canada, and I was told that applying to medical schools while in a post-grad program like masters or anything else is very unfavourable. You can only apply in your final year and then it looks alright because they know you'll be completing the degree before trying to pursue something else.

 

Does this sort of thing also apply for American medical schools? If I apply and gain entry to a Canadian pharmacy school, and end up going, if I were to then try and apply for American medical schools later on would it matter?