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Kava side effects

What can go wrong with kava, how common it is, and who should skip it.

By The Functional Sip · Updated October 2, 2026
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The short answer
Common kava side effects include upset stomach, headache and dizziness. More seriously, kava has been linked to rare cases of severe liver injury. Heavy long-term use can cause dry, scaly skin. Don't combine kava with alcohol or sedating medication.

Common side effects

The liver risk

Kava has been linked to rare cases of severe liver injury, including hepatitis and liver failure. The FDA issued a consumer advisory about this risk. It's rare, but it's the main reason to take kava seriously.

Heavy, long-term use

People who drink large amounts of kava over long periods can develop a dry, scaly skin condition sometimes called kava dermopathy.

Interactions

Don't combine kava with alcohol or with medication or supplements that cause drowsiness. Kava may also interact with medications processed by the liver.

Who should avoid kava

Questions people ask

What are the side effects of kava?

Upset stomach, headache and dizziness are common. Rarely, kava has been linked to severe liver injury.

Who shouldn't drink kava?

People who are pregnant or breastfeeding, have liver problems, or take medication that affects the liver or causes drowsiness.

For adults 21+. Don't mix with alcohol.