The word neuroleptic originates from the Greek word lepsis ("seizure"). Antipsychotics ( neuroleptics or tranquilizers) were investigated by the anesthesiologists De Castro and Mundeleer who coined the term<unk> , an anesthetic process that involves combining a major neuroleptic tranquilizer/antipsychotic with a potent opioid analgesic to produce a detached, pain-free state. This technique was widely used from the 1960s onwards, initially using a combination of phenoperidine and haloperidol, which was subsequently replaced in the early 1980s by a combination of fentanyl and droperidol. Efforts were also made to develop compounds which combined both types of activity in a single molecule.<unk>  results in amnesia among some patients, but not all. The technique has become less popular with the advent of more modern procedural sedation drug combinations, though it is still rarely used today as a combination of 2.5 mg droperidol and 50 μg (micrograms) of fentanyl in a ratio of 50:1. This combination is characterized by immobility, analgesia, and variable amnesia.
Neuroleptanalgesic
Equianalgesic
Muscle relaxant
Analgesic
Mood stabilizer
Local anesthetic
Antidote
Antianalgesia