Ava Pepper, Ava Root, Awa, Gea, Gi, Intoxicating Long Pepper, Intoxicating Pepper, Kao, Kavain, Kavapipar, Kawa, Kawa Kawa, Kawa Pepper, Kawapfeffer, Kew, Lawena, Long Pepper, Malohu, Maluk, Maori Kava, Meruk, Milik, Piper methysticum, Poivre des Cannibales, Poivre des Papous, Rauschpfeffer, Rhizome Di Kava-Kava, Sakau, Tonga, Waka, Wurzelstock, Yagona, Yangona, Yaqona, Yaquon, Yongona. <br/><br/>


Overview Information

Kava is a beverage or extract that is made from Piper methysticum, a plant native to the western Pacific islands. The name "kava" comes from the Polynesian word "awa," which means bitter. In the South Pacific, kava is a popular social drink, similar to alcohol in Western societies.

There are some BIG safety concerns about kava. Many cases of liver damage and even some deaths have been traced to kava use. As a result, kava has been banned from the market in Europe and Canada. This ban has hurt the economies of Pacific Island countries that export kava. Despite health concerns, kava has not been taken off the U.S. market.

Some people take kava by mouth to calm anxiety, stress, and restlessness, and to treat sleeping problems (insomnia). It is also used for attention deficit-hyperactivity disorder (ADHD), withdrawal from benzodiazepine drugs, epilepsy, psychosis, depression, migraines and other headaches, chronic fatigue syndrome (CFS), common cold and other respiratory tract infections, tuberculosis, muscle pain, and cancer prevention.

Some people also take kava by mouth for urinary tract infections (UTIs), pain and swelling of the uterus, venereal disease, menstrual discomfort, and to increase sexual desire.

Kava is applied to the skin for skin diseases including leprosy, to promote wound healing, and as a painkiller. It is also used as a mouthwash for canker sores and toothaches.

Kava is also consumed as a beverage in ceremonies to promote relaxation.

How does it work?

Kava affects the brain and other parts of the central nervous system. The kava-lactones in kava are believed to be responsible for its effects.


Uses & Effectiveness?

Possibly Effective for

  • Anxiety. Most research shows that taking kava extracts that contain 70% kavalactones can lower anxiety and might work as well as some prescription anti-anxiety medications. Most studies have used a specific kava extract (WS 1490, Dr. Willmar Schwabe Pharmaceuticals). But some inconsistent evidence exists. It's possible that treatment must last for at least 5 weeks and that kava supplements containing at least 200 mg kavalactones daily are needed for symptoms to improve. Also, kava might be more effective in people with severe anxiety, in female patients, or in younger patients.

Insufficient Evidence for

  • Withdrawal from drugs called benzodiazepines. Early research suggests that slowly increasing the dose of a specific kava extract (WS1490, Dr. Willmar Schwabe Pharmaceuticals) over the course of one week while decreasing the dose of benzodiazepines over the course of two weeks can prevent withdrawal symptoms and reduce anxiety in people who have been taking benzodiazepines for a long period of time.
  • Cancer. There is some early evidence that taking kava might help to prevent cancer.
  • A type of persistent anxiety marked by exaggerated worry and tension (generalized anxiety disorder or GAD). Early research shows that taking kava does not help to improve symptoms in people with generalized anxiety disorder.
  • Insomnia. Research on the effectiveness of kava in people with sleeping problems is inconsistent. Some research shows that taking a specific kava extract (WS1490, Dr. Willmar Schwabe Pharmaceuticals) daily for 4 weeks reduces sleeping problems in people with anxiety disorders. But other research suggests that taking kava three times daily for 4 weeks does not reduce insomnia in people with anxiety.
  • Symptoms of menopause. Early research shows that taking a specific kava extract (WS1490, Dr. Willmar Schwabe Pharmaceuticals) daily for 8 weeks reduces anxiety and hot flashes in menopausal women. Other research shows that taking kava daily for 3 months might reduce depression, anxiety, and hot flashes.
  • Stress. Early research suggests that taking a single dose of kava by mouth might reduce symptoms associated with mentally stressful tasks.
  • Attention deficit-hyperactivity disorder (ADHD).
  • Chronic fatigue syndrome (CFS).
  • Common cold.
  • Depression.
  • Epilepsy.
  • Restlessness.
  • Headaches.
  • Infection of the airways.
  • Menstrual problems.
  • Muscle pain.
  • Psychosis.
  • Sexual arousal.
  • Sexually transmitted diseases.
  • Skin diseases.
  • Swelling of the uterus.
  • Tuberculosis.
  • Urinary tract infections (UTIs).
  • Wound healing.
  • Other conditions.
More evidence is needed to rate kava for these uses.

Side Effects

Side Effects & Safety

When taken by mouth: Kava is POSSIBLY SAFE when taken by mouth, short-term. Kava extracts have been used safely under medical supervision for up to 6 months. Using kava can make you unable to drive or operate machinery safely. Do not take kava before you plan on driving. "Driving-under-the-influence" citations have been issued to people driving erratically after drinking large amounts of kava tea.

People may have heard that use of kava can cause liver damage. The use of kava for as little as 1-3 months has resulted in the need for liver transplants and even death in some people. Early symptoms of liver damage include yellowed eyes and skin (jaundice), fatigue, and dark urine. However, these cases appear to be relatively rare. Most patients who have used kava have not experienced liver toxicity. Also, some experts believe that the liver toxicity seen in these cases cannot be directly linked to kava. Other factors may have contributed to these toxic effects. To be on the safe side, people who choose to use kava should get liver function tests.

Special Precautions & Warnings:

Pregnancy and breast-feeding: Don't use kava if you are pregnant or breast-feeding. Kava is POSSIBLY UNSAFE when taken by mouth. There is a concern that it might affect the uterus. Also, some of the dangerous chemicals in kava can pass into breast milk and might hurt a breast-fed infant.

Depression: Kava use might make depression worse.

Liver problems: Kava can cause liver problems even in healthy people. Taking kava if you already have liver disease is taking a risk. People with a history of liver problems should avoid kava.

Parkinson's disease: Kava might make Parkinson's disease worse. Do not take kava if you have this condition.

Surgery: Kava affects the central nervous system. It might increase the effects of anesthesia and other medications used during and after surgery. Stop using kava at least 2 weeks before a scheduled surgery.



Major Interaction

Do not take this combination

  • Alprazolam (Xanax) interacts with KAVA

    Kava can cause drowsiness. Alprazolam (Xanax) can also cause drowsiness. Taking kava along with alprazolam (Xanax) may cause too much drowsiness. Avoid taking kava and alprazolam (Xanax) together.

  • Sedative medications (CNS depressants) interacts with KAVA

    Kava might cause sleepiness and drowsiness. Medications that cause sleepiness are called sedatives. Taking kava along with sedative medications might cause too much sleepiness<br /><br /> Some sedative medications include clonazepam (Klonopin), lorazepam (Ativan), phenobarbital (Donnatal), zolpidem (Ambien), and others.

Moderate Interaction

Be cautious with this combination

  • Levodopa interacts with KAVA

    Levodopa affects the brain by increasing a brain chemical called dopamine. Kava might decrease dopamine in the brain. Taking kava along with levodopa might decrease the effectiveness of levodopa.

  • Medications changed by the liver (Cytochrome P450 1A2 (CYP1A2) substrates) interacts with KAVA

    Some medications are changed and broken down by the liver.<br /><br /> Kava might decrease how quickly the liver breaks down some medications. Taking kava along with some medications that are changed by the liver might increase the effects and side effects of some medications. Before taking kava talk to your healthcare provider if you take any medications that are changed by the liver.<br /><br /> Some of these medications that are changed by the liver include clozapine (Clozaril), cyclobenzaprine (Flexeril), fluvoxamine (Luvox), haloperidol (Haldol), imipramine (Tofranil), mexiletine (Mexitil), olanzapine (Zyprexa), pentazocine (Talwin), propranolol (Inderal), tacrine (Cognex), theophylline, zileuton (Zyflo), zolmitriptan (Zomig), and others.

  • Medications changed by the liver (Cytochrome P450 2C19 (CYP2C19) substrates) interacts with KAVA

    Some medications are changed and broken down by the liver<br /><br /> Kava might decrease how quickly the liver breaks down some medications. Taking kava along with some medications that are broken down by the liver can increase the effects and side effects of your medication. Before taking kava talk to your healthcare provider if you take any medications that are changed by the liver<br /><br /> Some of these medications changed by the liver include amitriptyline (Elavil), clomipramine (Anafranil), cyclophosphamide (Cytoxan), diazepam (Valium), lansoprazole (Prevacid), omeprazole (Prilosec), lansoprazole (Protonix), phenytoin (Dilantin), phenobarbital (Luminal), progesterone, and others.

  • Medications changed by the liver (Cytochrome P450 2C9 (CYP2C9) substrates) interacts with KAVA

    Some medications are changed and broken down by the liver<br /><br /> Kava might decrease how quickly the liver breaks down some medications. Taking kava along with some medications that are broken down by the liver can increase the effects and side effects of some medications. Before taking kava talk to your healthcare provider if you take any medications that are changed by the liver.<br /><br /> Some medications that are changed by the liver include amitriptyline (Elavil), diazepam (Valium), zileuton (Zyflo), celecoxib (Celebrex), diclofenac (Voltaren), fluvastatin (Lescol), glipizide (Glucotrol), ibuprofen (Advil, Motrin), irbesartan (Avapro), losartan (Cozaar), phenytoin (Dilantin), piroxicam (Feldene), tamoxifen (Nolvadex), tolbutamide (Tolinase), torsemide (Demadex), warfarin (Coumadin), and others.

  • Medications changed by the liver (Cytochrome P450 2D6 (CYP2D6) substrates) interacts with KAVA

    Some medications are changed and broken down by the liver.<br /><br /> Kava might decrease how quickly the liver breaks down some medications. Taking kava along with some medications that are change by the liver can increase the effects and side effects of your medication. Before taking kava talk to your healthcare provider if you take any medications that are changed by the liver<br /><br /> Some medications that are changed by the liver include amitriptyline (Elavil), clozapine (Clozaril), codeine, desipramine (Norpramin), donepezil (Aricept), fentanyl (Duragesic), flecainide (Tambocor), fluoxetine (Prozac), meperidine (Demerol), methadone (Dolophine), metoprolol (Lopressor, Toprol XL), olanzapine (Zyprexa), ondansetron (Zofran), tramadol (Ultram), trazodone (Desyrel), and others.

  • Medications changed by the liver (Cytochrome P450 2E1 (CYP2E1) substrates) interacts with KAVA

    Some medications are changed and broken down by the liver<br /><br /> Kava might decrease how quickly the liver breaks down some medications. Taking kava along with some medications that are change by the liver can increase the effects and side effects of your medication. Before taking kava talk to your healthcare provider if you take any medications that are changed by the liver<br /><br /> Some medications that are changed by the liver include acetaminophen, chlorzoxazone (Parafon Forte), ethanol, theophylline, and drugs used for anesthesia during surgery such as enflurane (Ethrane), halothane (Fluothane), isoflurane (Forane), and methoxyflurane (Penthrane).

  • Medications changed by the liver (Cytochrome P450 3A4 (CYP3A4) substrates) interacts with KAVA

    Some medications are changed and broken down by the liver<br /><br /> Kava might decrease how quickly the liver breaks down some medications. Taking kava along with some medications that are broken down by the liver can increase the effects and side effects of some medications. Before taking kava, talk to your healthcare provider if you are taking any medications that are changed by the liver<br /><br /> Some medications changed by the liver include lovastatin (Mevacor), ketoconazole (Nizoral), itraconazole (Sporanox), fexofenadine (Allegra), triazolam (Halcion), and many others.

  • Medications moved by pumps in cells (P-Glycoprotein Substrates) interacts with KAVA

    Some medications are moved by pumps in cells. Kava might make these pumps less active and increase how much of some medications get absorbed by the body. This might increase the amount of some medications in the body, which could lead to more side effects. But there is not enough information to know if this is a big concern<br /><br /> Some medications that are moved by these pumps include etoposide, paclitaxel, vinblastine, vincristine, vindesine, ketoconazole, itraconazole, amprenavir, indinavir, nelfinavir, saquinavir, cimetidine, ranitidine, diltiazem, verapamil, corticosteroids, erythromycin, cisapride (Propulsid), fexofenadine (Allegra), cyclosporine, loperamide (Imodium), quinidine, and others.

  • Medications that can harm the liver (Hepatotoxic drugs) interacts with KAVA

    Kava might harm the liver. Taking kava along with medication that might also harm the liver can increase the risk of liver damage. Do not take kava if you are taking a medication that can harm the liver<br /><br /> Some medications that can harm the liver include acetaminophen (Tylenol and others), amiodarone (Cordarone), carbamazepine (Tegretol), isoniazid (INH), methotrexate (Rheumatrex), methyldopa (Aldomet), fluconazole (Diflucan), itraconazole (Sporanox), erythromycin (Erythrocin, Ilosone, others), phenytoin (Dilantin), lovastatin (Mevacor), pravastatin (Pravachol), simvastatin (Zocor), and many others.



The following doses have been studied in scientific research:


  • For Anxiety: 50-100 mg of a specific kava extract (WS 1490, Dr. Willmar Schwabe Pharmaceuticals), taken three times daily for up to 25 weeks, has been used. Also, 400 mg of another specific kava extract (LI 150, Lichtwer Pharma) taken daily for 8 weeks has been used. Five kava tablets each containing 50 mg of kavalactones have been taken in three divided doses daily for one week. One to two kava extract tablets has been taken twice daily for 6 weeks. Calcium supplements plus 100-200 mg of kava taken daily for 3 months has also been used.

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