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Hyronalin was a medicinal drug used to counter the effects of radiation poisoning. Adrenaline was the preferred treatment shortly after Earth's Atomic Age, but hyronalin replaced it after its discovery. (TOS: "The Deadly Years")

In 2267, Doctor Janet Wallace countered Leonard McCoy's recollection of adrenaline's usage in ancient history (when he mentioned it in relation to a possible cure for rapidly aging members of USS Enterprise's crew) by reminding him that hyronalin was the drug of choice now. (TOS: "The Deadly Years")

In 2367, hyronalin was used to protect the crew of the USS Enterprise-D from radiation poisoning when a three-hundred-year-old garbage scow was discovered. Dr. Crusher and her staff mass-replicated the drug and prepared to coordinate with Gamelan V's physicians in its administration. These actions were taken in response to projected radiation levels that would mostly have affected a trio of islands on the planet. On board the Enterprise, the ventilation system pumped hyronalin into the air supply as a counteragent against the radiation. This additive in the air gave the crew time for safely disposing of the scow into a star. (TNG: "Final Mission")

The following year, Crusher and La Forge required a few days of hyronalin treatment after exposure to plasma fire radiation. (TNG: "Disaster")

In 2371, Doctor Julian Bashir used hyronalin to treat Chief Miles O'Brien's radiation poisoning. (DS9: "Visionary")

In 2373, The Doctor inoculated Tom Paris temporarily against radiation poisoning from an astral eddy with a combination of hyronalin and lectrazine. (VOY: "Real Life")

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