It indic-ates that it is necessary to make a dissolution rate standard of the national pro-methazine hydrochloride tablets,as one of the standard of controlling mass.

• 八个批号只有四个达到美国药典21版标准；提示国产盐酸异丙嗪片有必要制定溶出度标准；作为质量标准控制之一.