Earlier quoted context omitted.
That seems wild. Do you have a citation to back that up? And in what country/countries?
I'm in the US, and there are a couple of wrinkles to this: insurance typically won't cover off label use, so patients end up paying the full cost of the medication, and if there is a big enough market, I believe companies can patent the new use even if the patents for the original use have run out. Doctors here are allowed to prescribe them though.
That's a lie, I get off-label drugs prescribed monthly covered.