0 to make an animal or person become unconscious or calm, especially with a drug:
In the past few years long-acting preparations of tranquillizing drugs have been developed which are of value in the treatment of schizophrenia.
Boophilus microplus: antihistaminic and tranquillizing drugs and cattle resistance.
In the first experiment the animal was tranquillized with acetyl promazine 1 h before each injection.
