Noranium hydride was a drug containing noranium and hydrogen. It had neurotoxic effects in some species.
In 2399, Doctor Agnes Jurati synthesized noranium hydride in the sickbay of La Sirena, which she administered to herself to neutralize a viridium tracker within her bloodstream. However, the drug also sent her into a coma. (PIC: "Nepenthe", "Broken Pieces")