sedative

https://doi.org/10.1351/goldbook.12067
Substance that exerts a soothing or tranquillizing effect, or describing the effect itself.
Compare: tranquilizer
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 904 [Terms] [Paper]