Question 1

How does kava work to reduce anxiety?

Accepted Answer

Kava's active compounds, called kavalactones, work primarily by binding to GABA-A receptors in the brain, enhancing the calming effects of gamma-aminobutyric acid (GABA), the body's primary inhibitory neurotransmitter. Kavalactones also modulate voltage-gated ion channels and affect dopamine and serotonin pathways. This multi-target mechanism produces anxiolytic and muscle-relaxant effects without significantly impairing cognitive function at standard doses. Kava's effects are often described as similar to benzodiazepines but without the same addiction risk. Evidence Level: C.

Question 2

What medications interact with kava?

Accepted Answer

Kava has significant drug interactions and should not be combined with central nervous system depressants like benzodiazepines, alcohol, barbiturates, or anticonvulsants, as this can cause excessive sedation and respiratory depression. Kava inhibits several CYP450 liver enzymes, potentially increasing blood levels of medications metabolized through these pathways. Avoid combining kava with hepatotoxic medications, acetaminophen, statins, or other herbs affecting liver function. Due to cumulative liver strain, kava should never be combined with alcohol. Evidence Level: C.

Question 3

What is the recommended dosage of kava for anxiety?

Accepted Answer

The standard adult dosage for anxiety is 120-250 mg of kavalactones daily, typically divided into two or three doses. This usually corresponds to 1-2 grams of dried kava root or 2-4 mL of liquid extract daily. Standardized extracts containing 70% kavalactones are commonly used in clinical studies. Effects typically begin within 1-2 hours of consumption. Long-term daily use beyond 3 months is not recommended without medical supervision due to potential liver concerns. Evidence Level: C.

Question 4

Is kava safe during pregnancy and breastfeeding?

Accepted Answer

Kava is considered unsafe during pregnancy and breastfeeding and should be avoided entirely. There is insufficient safety data for fetal development, and kavalactones may cross the placenta or pass into breast milk. Kava's effects on the liver and central nervous system pose potential risks to developing fetuses and nursing infants. Additionally, kava's sedative properties could affect infant development and feeding patterns. Women who are pregnant, planning pregnancy, or breastfeeding should not use kava. Evidence Level: D.

Question 5

Does kava cause liver damage?

Accepted Answer

Reports of kava-related liver damage led to bans in several countries during the early 2000s. However, subsequent analysis suggests most cases involved poor-quality products, incorrect plant parts (leaves and stems instead of noble root), or pre-existing liver conditions. Quality-controlled kava root extracts from reputable sources appear to have a low risk of hepatotoxicity when used appropriately at recommended doses. Individuals with liver disease, heavy alcohol use, or those taking hepatotoxic medications should avoid kava entirely. Evidence Level: C.

Médicament	Sévérité	Description
Alprazolam (Xanax)	Sévère	Combiner le kava avec des benzodiazépines peut provoquer une sédation excessive, coma ou une dépression respiratoire. Un cas de coma a été signalé avec cette combinaison.
Acetaminophen (Tylenol)	Sévère	Le kava associé à l'acétaminophène peut augmenter le risque de lésions hépatiques, les deux substances étant hépatotoxiques.
Alcohol	Sévère	Combiner le kava avec de l'alcool augmente considérablement le risque de lésions hépatiques et de dépression excessive du système nerveux central.
Levodopa	Sévère	Le kaven réduit l'efficacité complémentaire de la levodopa, aggravant les symptômes parkinsoniens.

Kava

Sources et citations

Valerian

Passionflower

St. John's Wort

⚠️ Non recommandé pendant la grossesse ou l'allaitement

4 interactions médicamenteuses connues — Certaines peuvent être graves

Contre-indications

Effets secondaires possibles

Qu'est-ce qu'une interaction plante-médicament ?

Interactions Médicamenteuses Connues (4)

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Interactions médicamenteuses

Synthèse des preuves

Sources PubMed

Sources gouvernementales