A general anaesthetic (or anesthetic, see spelling differences) is a drug that brings about a reversible loss of consciousness. These drugs are generally administered by an anaesthesia provider to induce or maintain general anaesthesia to facilitate surgery. The biological mechanism(s) of the action of general anaesthetics are not well understood.
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“Could anything be more indicative of a slight but general insanity than the aspect of the crowd on the streets of Chicago?”
—Charles Horton Cooley (1864–1929)