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Strelamine is a sedative drug used by Starfleet medical personnel in the 23rd century.
In 2268, in sickbay of the USS Enterprise, Dr. Leonard McCoy performed surgery on the injured Klingon Captain Kalan of the IKS Terror, then injected him with strelamine, enough to sedate him for eight hours, to help him recover. (TOS novel: The Klingon Gambit)