This cannot work on a large scale. Here’s why. Canada and most other national markets have socialist price controls on their drugs. The US cooperates with this socialized medicine scheme by using the drug certification process. For a pharma company to get US certification it has to agree to produce allotments of their drugs and sell them at reduced prices to foreign countries. So a pill that costs ten dollars to the consumer in the US might cost one dollar in, say, Canada. What happens is the Canadian pharmacy can sell that drug they got for, say fifty cents, in the US market for, say seven dollars. Big win, right? This means the Canadian pharmacies don’t sell their drugs in Canada. Several years ago, there was a study published on the numbers of Canadians coming across the border into the US for emergency treatment because they could not get what are common drugs in the US.
I’m reminded of the book “Buy Real-estate With No Money Down.” I had an uncle who did this a lot. But once everyone was doing it, nobody could do it. Same thing with drugs. It worked only so long as everyone wasn’t doing it. There has to be a blowback. Either the US will stop allowing the drugs in the country or other countries will criminalize selling the out of market.
I recall reports of Canadians crossing into the U.S. to receive diagnostic studies and therapeutic treatments (e.g. surgery) because the wait times were much longer in Canada. I have not heard of medications readily available in the U.S. which were not available in Canada.