It’s the pharmacy that does the shipping not you. My physician will fax prescriptions to Canadian Pharmacy services. The prescription stays valid for a couple years.
I’ve been very happy with them. They will tell you what country the drug is coming from and I think you can request that the drug comes from Canada not sure about that. But you have to consider, if you are reluctant to buy from outside US because of quality that indeed others from these countries survive and live without FDA review.