major tranquilizer

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a drug with a calming, soothing effect; currently it is usually used to mean an antianxiety agent (minor tranquilizer).
major tranquilizer former term for antipsychotic agent.
minor tranquilizer antianxiety agent.

an·ti·psy·chot·ic a·gent

a functional category of neuroleptic drugs that are helpful in the treatment of psychosis and have a capacity to ameliorate thought disorders.

major tranquilizer

References in periodicals archive ?
Yet another paper, published in The American Journal of Psychiatry in 1964, found that major tranquilizers can "produce an acute psychotic reaction in an individual not previously psychotic.
These horrifying effects occur in more than 20% of persons "treated" with major tranquilizers and currently affect 400,000-1,000,000 Americans.
In the same way that major tranquilizers can throw the muscle-control portion of the brain into chaos, they also can make the thought-control area of the brain supersensitive, driving the person permanently insane.
The use of two types of medication appears to influence length of stay: antidepressants being taken at the time of admission and major tranquilizers administered at the time of discharge.
For demented patients, low-dose major tranquilizers can be helpful if a careful evaluation for other underlying problems, including depression, is first undertaken.