Synonyms of 'tranquillizer'
An opiate is a drug that contains opium. Opiates are used to reduce pain or to help people to sleep.
She had to take opiates to control the pain.
Thesaurus for tranquillizer from the Collins English Thesaurus
A tranquillizer is a drug that makes people feel calmer or less anxious . Tranquillizers are sometimes used to make people or animals become sleepy or unconscious .