Seems to me you can just ship it to yourself at a specific address. Just get a photocopy of the Rx from your regular pharmacy, have your doctor write a quick note saying it's for your personal use for medical reasons, and toss in a dark or poor photocopy of your passport. Mail it when you leave Canada and carry the first 3 months' supply with you.
Since you're mailing it from and to yourself, you can use any mail service you trust (fedex, ups, etc.) and will know that you're getting the same formulation that you always have.
