Your solution is needlessly complicated and overreaching. How about you just make it illegal for doctors (as in the people who actually write the prescriptions)

Your solution is needlessly complicated and overreaching. How about you just make it illegal for doctors (as in the people who actually write the prescriptions) to interact in any way with pharmaceuticals companies? Outside, of course, of simply reading specifications on drugs and seeing what they do. If the people who administer the care have their incentive disconnected from the amount of time the patient spends in treatment, that seems to solve the problem.