In most Canadian provinces, the provincial government is the only authorized purchaser for prescribed medication. It is then sold to pharmacies and hospitals, who are in charge of distribution. (in some provinces, such as Quebec, a mix of public or private insurance will then cover most of the purchase of medication; everyone is covered by the public plan, but your employer is mandated to get a private plan if they can)

When Shkreli says "f-- Walmart" (in the Vice interview), it's horrifying, because I know a lot of people in the US who are not covered by insurance, so they buy medication at Walmart.. This is really hard to understand.