Americans rely extensively upon prescription medications to maintain health and quality of life. According to the National Center for Health Statistics, in 2002, at least 1.5 billion drugs were prescribed to patients in physician offices, 196 million in US emergency departments, and 140 million in outpatient settings. Almost two-thirds of visits to physician offices and hospital outpatient departments had at least one drug associated with the visit, and 7% of visits had five or more drugs. In 2004, US pharmacies dispensed over 3.5 billion prescriptions to patients. Estimates indicate that annual expenditures for prescription drugs in the US top $230 billion dollars each year—and there is every indication that these numbers will only increase.
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Bryan A. Liang (2006) studied this question.
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