In 2002, the Food and Drug Administration issued a warning about the possibility of kava supplements causing severe liver injury. Since then, several countries in Europe have banned sales of the herb without a prescription in an effort to prevent serious health problems. Kava does not affect everybody the same way and some people experience only mild side effects. When in doubt, it makes sense to consult with your health practitioner before taking kava or any other herbal supplement.
Drug Interactions
As other herbs, kava can interact with prescription and over-the-counter drugs, causing serious side effects if not monitored carefully. According to Drugs.com, kava interacts with Parkinson's drug, levodopa, worsening the symptoms of the disease. It also affects those taking the drug alprazolam, best known under the commercial name Xanax, used to treat anxiety disorders. MedLine Plus also adds that kava may worsen the effects of monoamine oxidase inhibitors (MAO-I) antidepressants and sedatives.
Liver Damage
Kava has come under scrutiny for its link to liver damage. The U.S. Department of Agriculture has issued several warnings regarding the safety of kava, especially when it comes to liver issues. MedLine Plus reports cases of liver toxicity and liver failure. Kava should not be taken along with medications such as acetaminophen, which affect the liver and may lead to serious problems when the two are combined. People who suffer from liver problems should not use kava.
Other Side Effects
Kava can cause a number of other side effect, some of which are serious, while others are just bothersome. Long-term use of kava can cause dangerous side effects that include seizures, pulmonary hypertension and psychotic episodes. Skin disorders and kidney damage are also possible. Symptoms that can appear after just a few days of regular use include drowsiness, vision problems, vomiting and urinary retention.
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