Fig. 5

Visual analysis of novel drug delivery routes. Analyzing the co-occurrence frequency of keywords in the literature data related to new drug delivery routes using a bubble chart. The size of the bubbles represents the frequency of keywords, and the thickness of the links between bubbles represents the degree of connection between keywords. The results show that the transdermal route, intranasal route, transcutaneous route and other drug delivery routes are currently the main research targets of new drug delivery routes