With drug companies, once they have a drug licensed, they see no merit in doing that. They just want to sell as much of the drug as they can. You can see why they'd want to do that.
They haven't done the sorts of studies that one would have wished into the adverse effects, the long-term studies. They could have done a case-controlled study, for example, of rare adverse effects. That hasn't been done by Hoffman-LaRoche, so the answer is no.