1. Of or pertaining to any action that changes or influences mood or spirit, particularly such action that is favorable in mentally depressed patients.
2. A drug that counteracts mental depression by a mood-elevating or mind-stimulating action; a psychic energizer or stimulant.
3. Influencing or changing mood; referring to drugs that ameliorate pathological depressive states but, in the bsence of depression, do not act as central nervous system stimulants.