1) Depressants 2) Opiates 3) Opioids 1) Mickey agents 2) They calm 3) They might put you out 4) Tranquilizing agents 5) Tranquillisers 
herbs that relax the central nervous system
Class of drugs used to treat a range of problems including insomnia and anxiety
a group of drugs that have a calming effect; used to treat anxiety and pain, bring on sleep, and help relax a person before surgery 
Drugs that slow down the nervous system.