Seems your concerns about doctor's ties to drug companies has been around much longer that I ever thought,

Concerns over the often cosy relationships between doctors and pharmaceutical industry go back a long way - at least as far back as the
14th century. In his Canterbury Tales, Chaucer writes of the Doctor

All of his apothecaries in a tribe
Were ready with the drugs he would prescribe
And each made money from the other's guile
They had been friendly for a goodish while

Coghill translation from the Middle English