Melenex
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Melenex is an anesthetic carried in 2260s Starfleet medkits.
In 2269, Doctor McCoy used melenex to make Spock appear ill, fooling the computer that controlled the Shore Leave Planet. McCoy described the effects of melenex as "brief unconsciousness and temporary skin discoloration", adding that "it looks worse than it is."
Once the doctor dosed Spock with ten ccs of melenex via hypospray, McCoy told Spock that it would take ten seconds to take effect, resulting in unconsciousness for less than five minutes. (TAS: "Once Upon a Planet")
