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Memory Alpha

Theragen

Theragen is actually a bio-weapon developed by the Klingons. At full-strength it is a nerve agent that is extremely lethal, but at much smaller doses, it can temporarily deaden certain nerve inputs to the brain, having a "calming" effect on an insane and/or abnormally enraged person. This "non-lethal" use was first used on the crew of the USS Enterprise during a long stay in a section of space that had just such of an extreme maddening effect on the crew, slowly rendering them all insane. Doctor McCoy, the ship's Chief Medical Officer, discovered how to use the Theragen dirivitive to "calm" the crew long enough to retrieve the Captain from a dimensional rift in space and return the ship to normal space. The medicine is now listed in the Starfleet Medical Database.

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