Didn't give inaccurate information, while in Canada (Nova Scotia) I was told by pharmacy that they could not fill my blood pressure med because the Canadian government did not honor American doctors prescriptions. I had to take my meds and prescriptions to a Canadian doctor for a Canadian prescription. The doctor said it happens all the time.
Now, if you are talking mail order prescriptions. I know nothing about that and would have not replied to this thread.
This is not what happened to a friend or what someone told me. This was my personal experience.
Possibly filling the script whilst in country vs via mail order has different regulations.