METHODS:The magnesium concentrations were determined by AAS method. The parameters were calculated and the sustained release effect of MCST was inspected.

• 方法：采用原子吸收分光光度法测定氯化镁缓释片和进口氯化镁缓释片（Slow?Mag）的体内外释放浓度，计算体内外参数，考察氯化镁缓释片的缓释效果，并与Slow?Mag进行对照。