Kava

Topic Overview

What is kava?

Kava—or kava kava—is a root found on South Pacific islands. Islanders have used kava as medicine and in ceremonies for centuries.

Kava has a calming effect, producing brain wave changes similar to changes that occur with calming medications such as diazepam (Valium, for example).¹ Kava also can prevent convulsions and relax muscles.² Although kava is not addictive, its effect may decrease with use.

Traditionally prepared as a tea, kava root is also available as a dietary supplement in powder and tincture (combined with alcohol) forms.

What is kava used for?

Research has shown that kava's calming effect relieves anxiety, restlessness, sleeplessness, and stress-related symptoms such as muscle tension or spasm. You can also use kava as a pain medication (analgesic).^{3, 2}

When taken for anxiety or stress, kava does not interfere with mental sharpness.¹ When taken for sleep problems, kava promotes deep sleep without affecting restful REM sleep.⁴

Kava may be used instead of prescription anti-anxiety drugs, such as benzodiazepines and tricyclic antidepressants. Kava should never be taken with these prescription drugs.⁴ Avoid using alcohol when taking kava.

Is kava safe?

Health Canada has banned the sale of kava products in Canada because there is not enough proof that it is safe to use.

Before you use kava, consider that it:

• Should not be combined with alcohol or psychotropic medications. Psychotropic medications are used to treat psychiatric disorders or illnesses and include antidepressants and mood stabilizers. Alcohol exaggerates kava's sedating effect.
• Can affect how fast you react, making it unsafe to drive or use heavy machinery.
• May gradually be less powerful as you use it.
• Eventually may cause temporary yellowing of skin, hair, and nails.
• Can cause an allergic skin reaction (rare).

Long-term kava use may result in:

• Liver problems.
• Shortness of breath (reversible).
• Scaly rash (reversible).
• Facial puffiness or swelling (reversible).

In 2002, reports from Germany and Switzerland about kava causing serious liver problems led Health Canada to ban the sale of kava in Canada. Other countries have advised consumers to avoid using kava until further information is available.

In the United States, the FDA advises people who have liver disease or liver problems, or people who are taking drugs that can affect the liver, to consult a doctor or pharmacist before using products that contain kava. People who use a dietary supplement that contains kava and experience signs of illness should consult a doctor. Symptoms of serious liver disease include brown urine as well as yellowing of the skin or of the whites of the eyes. Other symptoms of liver disease may include nausea, vomiting, light-coloured stools, unusual tiredness, weakness, stomach or abdominal pain, and loss of appetite.

Always tell your doctor if you are using a dietary supplement or if you are thinking about combining a dietary supplement with your conventional medical treatment. It may not be safe to forgo your conventional medical treatment and rely only on a dietary supplement. This is especially important for women who are pregnant or breast-feeding.

When using dietary supplements, keep in mind the following:

• Like conventional medicines, dietary supplements may cause side effects, trigger allergic reactions, or interact with prescription and non-prescription medications or other supplements you might be taking. A side effect or interaction with another medication or supplement may make other health conditions worse.
• The way dietary supplements are manufactured may not be standardized. Because of this, how well they work or any side effects they cause may differ among brands or even within different lots of the same brand. The form of supplement that you buy in health food or grocery stores may not be the same as the form used in research.
• Other than for vitamins and minerals, the long-term effects of most dietary supplements are not known.

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Author:	Caroline Rea, RN, BS, MS Sydney Youngerman-Cole, RN, BSN, RNC	Last Updated: October 1, 2007
Medical Review:	Kathleen Romito, MD - Family Medicine Marc S. Micozzi, MD, PhD - Policy Institute for Integrative Medicine Donald Sproule, MD, CM, CCFP, FCFP - Family Medicine
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