Effects
Medical literature sometimes claims kava has a "potential for addiction" because "it produces mild euphoria and relaxation". In a traditional setting, a moderately potent kava drink causes effects within 20–30 minutes that last for about two and a half hours, but can be felt for up to eight hours. Some report longer-term effects up to two days after ingestion, including a feeling of mental clarity, patience, and an ease of acceptance. The effects of kava are most often compared to alcohol, or diazepam.
The sensations, in order of appearance, are slight tongue and lip numbing (the lips and skin surrounding may appear unusually pale), mildly talkative and sociable behavior, clear thinking, calmness, relaxed muscles, and a sense of well-being. As with other drugs that affect the GABA receptors, there can also be paradoxical dysphoria. The numbing of the mouth is caused by the two kavalactones kavain and dihydrokavain, which cause the contraction of the blood vessels in these areas, acting as a local topical anesthetic. These anesthetics can also make one's stomach feel numb. Sometimes, this feeling has been perceived as nausea.
The effects of a kava drink vary widely with the particular selection of kava plant(s) and amount. A potent drink results in a faster onset with a lack of stimulation; the user's eyes become more sensitive, the person soon becomes somnolent and then has deep, dreamless sleep within 30 minutes. Sleep is often restful and pronounced periods of sleepiness correlate to the amount and potency of kava consumed. Kava drinkers are often perceived as having lazy days after consumption of kava the night before, which can be expected as many active kavalactones have half lives of approximately 9 hours. Although heavy doses can cause deep, dreamless sleep, many people reportedly experience lighter sleep and rather vivid dreams after drinking moderate amounts of kava.
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