narcotic

https://doi.org/10.1351/goldbook.11907
  1. Nonspecific usage – an agent that produces insensibility or stupor.
  2. Specific usage – any natural or synthetic substance that has morphine-like actions.
See also: opioid
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 885 [Terms] [Paper]