Nasal numbing agent
A nasal numbing agent was an injection to reduce the sensitivity of odor perception.

Sub-commander T'Pol took injections to reduce her sensitivity to the smell Humans produced. While being held hostage at the monastery at P'Jem, she told Captain Jonathan Archer about the difficulties of sharing a blanket with him because she'd had her last nasal numbing agent over twenty-four hours previously. ()

See also
Deodorant

de:Geruchsblocker
Drugs