How to Say "arousal agent" in Spanish
The Spanish word for “arousal agent” is “excitante” — C1 level.
English → SpanishC1
nounC1formal
something that causes strong interest or physical reaction

Examples
El café es un excitante del sistema nervioso.
Coffee is a stimulant for the nervous system.
Buscar un nuevo excitante es una tendencia humana.
Searching for a new thrill is a human tendency.
Using the Adjective as a Noun
When you put an article (like 'el' or 'un') in front of 'excitante,' it stops being a describing word and becomes the name of the thing itself: 'el excitante' means 'the stimulating thing' or 'the stimulant.'
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