Is kava an upper or downer?

Excuse me, could you please clarify something for me? I've come across the term "kava" and I'm wondering if it's classified as an upper or a downer? By upper, I mean a substance that typically stimulates the central nervous system, causing an increase in energy, alertness, and sometimes even feelings of euphoria. And by downer, I'm referring to a substance that has the opposite effect, often leading to relaxation, sedation, and even drowsiness. Could you enlighten me on whether KAVA falls into one of these categories, or if it has a different effect altogether?