美国认真关注不安全药物或器械上市后使用带来的问题。ＦＤＡ有责任保证所有已上市产品的安全性 ,除了委托生产者报告不良反应外 ,它还依赖一种自愿报告系统。显示其有效性相当有限 ,新近许多因不良反应而被迫取消的药品 ,增加了公众的顾虑。这些事件迫使药物生产者和ＦＤＡ认? The United States is seriously concerned about the problems posed by the use of unsafe drugs or devices after their listing. FDA is responsible for ensuring the safety of all marketed products and, in addition to commissioning producers to report adverse events, it relies on a voluntary reporting system. Showing that their effectiveness is rather limited and that many new drugs that have been canceled as a result of adverse reactions have raised public concern. These events force drug producers and FDA recognized?