Hyronalin

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Hyronalin was a drug used to treat radiation poisoning, used during the 23rd and 24th centuries. (TOS episode: "The Deadly Years")

A hyronalin derivative was used by Federation sociological observers on planet NGC 667 due to the degree of naturally occuring radiation on that world. (TOS short story: "First, Do No Harm")

In 2371, Julian Bashir treated Miles O'Brien with hyronalin after he was exposed to radiation from a plasma conduit. (DS9 episode: "Visionary")

In 2376, the inhabitants of Europa Nova used hyronalin to treat those suffering from exposure to the theta radiation from the Malon tanker Apsac. They began to run out, although they changed to arithrazine as it better treated the unusual effects of theta radiation better than hyronalin. (DS9 novel: Demons of Air and Darkness)

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Hyronalin article at Memory Alpha, the wiki for canon Star Trek.