> I thought I had a link here somewhere, but can't find it; I have a strong suspicion that the companies have a preference to repackage or reformulate existing drugs, and that basic research on new drugs is disproportionately covered by the public purse and charity.

Absolutely there are companies which do this, and there are some very interesting examples of somewhat shady practices, but the vast majority of companies which you think of as 'pharma' --i.e. big pharma, and the big biotechs-- survive by discovering or insourcing and then developing new drugs, and/or developing their existing drugs in new indications.