自本刊2卷10期发表了一篇匹咖卡因注射液的配制以后,由于匹咖卡因对疼痛的疗效较佳,故引起各地读者的注意而广为采用。惟匹咖卡因注射液制成后,不耐久贮,容易产生结晶,在应用上尚存在着一些困难。本刊虽已针对这些困难,在2卷11期、3卷2期和4期上分别介绍过一些解决方法,但问题仍没有得到彻底的解决.为此,本期中除发表下面 Since the publication of Volume 2, Issue 10, a preparation of pico-caine injection has been widely adopted due to its better curative effect on pain. However, pika caffeine injection is made, not durable storage, easy to produce crystallization, there are still some difficulties in the application. Although these issues have been addressed in these issues, we have introduced some solutions in Volumes 2, 11, 3, and 4, respectively, but the problems have not yet been completely solved.