Kava
kawa, waka, lewena, yaqona, grog, sakau, 'awa, 'ava, wati, Piper methysticum
Kava is a depressant drug, which means it slows down the messages travelling between the brain and the body. Kava is made from the root or stump of the kava (Piper methysticum) shrub. 
Kava comes in different forms including a brownish-coloured drink, brown powder, capsules, extracts or drops.
Source: Alcohol and Drug Foundation