There may be requirements to purchase the drug from manufacturers that comply with government regulated quality controls.<p>Not that someone who really needs the drug couldn&#x27;t seek out an online source to get it cheaply from overseas, but doctors may not be able to legally prescribe it from those places.<p>I don&#x27;t have any knowledge on the subject though, just speculating. At least in the US buying directly from overseas pharmacies seems to be more or less illegal.