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ＡｓｔｒａＺｅｎｅｃａ公司的美托洛尔（ｍｅｔｏｐｒｏｌｏｌ）缓释剂Ｔｏｐｒｏｌ-ＸＬ ２５ｍｇ用于稳定性或 Ⅱ和Ⅲ级症状性缺血性心衰、高血压及心肌病的治疗获美国ＦＤＡ许可，并已上市。 新的低剂量β阻滞剂片剂还有５０、１００和２００ｍｇ规格的Ｔｏｐｒｏｌ－ＸＬ
AstraZeneca metoprolol extended-release Toprol-XL 25mg is used for stability or grade II and III symptomatic ischemic heart failure. Hypertension and cardiomyopathy are approved by the US FDA and are available now. The new low-dose beta blockers are also available in 50, 100 and 200 mg Toprol-XL