"Does it make a good mix with Scotch?"

Theragen was a chemical compound initially developed as a nerve gas by the Klingons. In its pure form it was lethal, but when diluted with alcohol it could temporarily deaden certain nerve inputs to the brain, having a calming effect on an insane and/or abnormally enraged person.

A theragen derivative was first used as an effective treatment on the crew of the USS Enterprise in 2268, following an extended interaction with the effects of interphase space. Leonard McCoy, the ship's chief medical officer, discovered how to use the theragen derivative to ameliorate the baneful effects on the crew long enough for the Enterprise to complete her mission. After asking McCoy whether it would mix well with scotch (which the doctor believed it would), Montgomery Scott happily absconded with the remainder of the derivative. (TOS: "The Tholian Web")

Theragen is listed under "Drugs" in the Star Fleet Medical Reference Manual, where the entry on it admits that its history and derivation are unknown. The usual dilution ratio is listed there as 3 ccs of theragen to 500 ccs of alcohol, specifically ethanol.

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