(~s)
1.
Narcotics are drugs such as opium or heroin which make you sleepy and stop you feeling pain. You can also use ~s, especially in American English, to mean any kind of illegal drug.
He was indicted for dealing in ~s...
N-COUNT
2.
If something, especially a drug, has a ~ effect, it makes the person who uses it feel sleepy.
...hormones that have a ~ effect on the immune system.
ADJ