A composition for the treatment of emesis comprising 8-hydroxy-2-(dipropylamino)tetralin in which the ratio of the S enantiomer of the 8-hydroxy-2-(dipropylamino)tetralin to the R enantiomer of the 8-hydroxy-2-(dipropylamino)tetralin is between 2:1 and 10:1, and a method of treating or preventing emesis with such a composition.
