Pills tracked from doctor to patient to aid drug marketing

In the old days, sales representatives from drug companies would chat up local pharmacists to learn what drugs doctors were prescribing. Now such shoulder-rubbing is becoming a quaint memory — thanks to vast databases of patient and doctor information being used by pharmaceutical companies to market drugs. The information allows drug makers to know which drugs a doctor is prescribing and how that compares to a colleague across town. They know whether patients are filling their prescriptions — and refilling them on time. They know details of patients' medical conditions and lab tests, and sometimes even their age, income and ethnic backgrounds.