Two months ago, Mimi, 42, walked into her pharmacy in Fairfield, Conn., to pick up a refill of the medicine she'd taken for years for her migraine headaches -- and stormed out with a headache larger than she'd ever imagined.
She couldn't get a refill, her druggist told her, because a company that manages pharmacy benefits had decided she was taking too many kinds of medicine. Mimi, a mother and parttime psychotherapist who asked that her full name not be used, called two of her doctors.
She found that the company, York Prescription Benefits, had written each a letter listing every medication she was taking for asthma, joint pain and allergies, along with the …