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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 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. Doctor Crusher and her staff mass-replicated the drug and prepared to coordinate with Gamelan V's physicians in the administration of it. 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")