目的：分析美国卫生机构药品支出的趋势与影响因素，认识其规律。
Objective: to analyze the trends and affected factors of the drug expenditure in American health institutions and describe some rules.
《报告》估计，如果使用非专利药品替代原创产品，那么国家将可以节省60%左右的药品支出。
The report estimates that countries could save about 60% of their pharmaceutical expenditures by shifting from originator medicines to generic products.
方法：收集美国卫生系统的有关药房药品支出的报道和论文，采用描述性方法研究药品支出与影响因素之间的关系。
Methods:The literature about drug expenditure in American health system pharmacy was collected and the relationship between the drug expenditure and the factors was described.
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