Trioxin is a medicine used in the treatment of respiratory injuries. It is used in emergency situations as a stop-gap measure, Doctors usually prefer to treat the injury itself if they have the time and capability.

In an alternate timeline, The Doctor was ordered by Captain Janeway to inject her with trioxin after her alveoli were damaged by nebular gas in 2374. (VOY: "Year of Hell, Part II")

During the assent of orbital tether, Tuvok used trioxin to ease the effects of hypoxia on the cart's crew. (VOY: "Rise")