Pharma rep is no longer seen by management as a career, they just don't bother to tell the employee. Its an entry level job. Burn you out and use you up for 10-12 years then discard you before you become a health or fiscal liability. There are actuarial tables in HR somewhere for employees. At Merck if you haven't moved from pcp rep into speciality, management, hospital etc. then there must be something wrong with you and you're expendable. You're just a low impact message board, a placeholder because everyone else has a presence in offices so Merck has to be there too plus it gives the legion of managers something to do. Formularies rule so reps don't much impact prescribing decisions much which is true. Merck's arrogance tells them that their products are so good that anyone can sell them, which,of course is not true.
If you have any brains,talent,skills,ambition, or real training you should have exited pharma long ago.