This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One that serves to tranquilize, as soothing music.

n. Any of various drugs used to reduce tension or anxiety; an antianxiety agent.

n. Any of various drugs used to treat psychotic states; an antipsychotic drug. Not in scientific use.

n. That which tranquillizes or soothes.

n. A drug used to reduce anxiety or tension; a sedative.

n. One who, or that which, tranquilizes.

n. One who or that which tranquilizes. Also spelled tranquiliser, tranquilliser.

n. a drug used to reduce stress or tension without reducing mental clarity

"So drugs like fluphenazine (a long-term tranquilizer) is not allowed under most racing jurisdictions or under USEF and FEI rules, but racing jurisdictions may not expend the cost at the lab level to detect this drug that USEF and FEI would because of the potential for abuse in jumpers and show horses."

tranquillizer   

sedative-hypnotic drug    sedative-hypnotic    psychotropic agent   

horse tranquilizer    sleeping pill   

neuroleptic drug    minor tranquillizer    major tranquilliser    anxiolytic    minor tranquilizer    anxiolytic drug    neuroleptic    major tranquilizer    major tranquillizer    neuroleptic agent   

tranquilizers    painkiller    trank    antihistamine    coramine    hyoscine    small-caliber    anesthetic    tranq    gauss