gerund of tranquilize
The act of calming a person or animal, or putting them to sleep, using a drug.
present participle of tranquilize
tending to soothe or tranquilize
"valium has a tranquilizing effect"
"took a hot drink with sedative properties before going to bed"
Of a drug: having the effect of calming a person or animal, or putting them to sleep; sedating, sedative.