Patent 8722065 was granted and assigned to MEDRx on May, 2014 by the United States Patent and Trademark Office.
The present invention discloses a novel tape preparation containing lidocaine at a high concentration. A tape preparation containing lidocaine at a high content, which has a lidocaine content of 10 w/w % or more, can be produced by using a lactic acid salt of lidocaine, while preventing the precipitation of a crystal of lidocaine.