From Halopedia, the Halo wiki
Narcolytic metabolase is a human drug. It is an enzyme that, when injected into a person, consumes all analgesic agents in the patient's bloodstream, waking them up if they were sedated.
Dr. Catherine Halsey used narcolytic metabolase on a sedated Kelly-087 when they arrived at Onyx aboard the Beatrice.
List of appearances
- Halo: Ghosts of Onyx (First appearance)
- ^ Halo: Ghosts of Onyx, Chapter 16