
A 34-year-old woman complains of headaches that interfere with work. Her first headache episode, approximately 6 yearsearlier, was relatively mild. Initially, she experienced attacks only once every 3 to 4 months and managed them effectivelywith over-the-counter (OTC) agents. However, in the last 6 months the attacks have become more frequent-they occur atleast twice a month-and are so severe that she misses work.