In The Vampire Diaries, season 5 episode 6, Katherine injects Dr. Wes Maxfield with a substance to make him unconscious.
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In Dexter, serial killer Dexter Morgan knocks out his victims using a syringe of M99 (etorphine) in almost every episode throughout the show.
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He illegally obtains the drug using the pseudonym Dr. Patrick Bateman.
Etorphine (a.k.a. Immobilon or M99), a veterinary tranquilizer