transmucosal

adjective

trans·​mu·​co·​sal ˌtran(t)s-myü-ˈkō-zᵊl, ˌtranz- 

: relating to, being, or supplying a medication that enters through or across a mucous membrane (as of the mouth)

transmucosal fentanyl

Noven Pharmaceuticals develops transdermal and transmucosal drug delivery systems and technologies.

—The Miami Herald