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Although Kava is considered safe when used properly, there are certain situations in which its use is not recommended or contraindicated:
- ●Liver diseases
- ●Pregnancy & lactation
- ●Children under 18 years
- ●Parkinson's disease
- ●Severe depression
- ●Before planned surgeries
Absolute Contraindications
Kava should under no circumstances be used in the following conditions. The risks clearly outweigh any potential benefits.
Liver Diseases
Strictly contraindicated
Individuals with existing liver diseases should completely avoid Kava:
- •Hepatitis (A, B, C): Active or chronic liver inflammation
- •Liver cirrhosis: Regardless of the stage
- •Fatty liver: Alcoholic and non-alcoholic fatty liver disease
- •Elevated liver values: Unexplained increase in ALT, AST, GGT
- •Previous liver damage: Even if currently normalized
Reason: The liver is the central organ for the metabolism of Kavalactones. With impaired liver function, metabolites can accumulate and increase the risk of further damage.
Pregnancy & Lactation
Strictly contraindicated
Kava should not be used during pregnancy and lactation:
- •No safety data: There are no controlled studies on safety during pregnancy
- •Placental permeability: Kavalactones can cross the placental barrier
- •Breast milk: Kavalactones pass into breast milk
- •Uterine relaxation: Kavain can relax uterine muscles
Traditional Practice: In Pacific cultures, Kava is traditionally not consumed by pregnant or breastfeeding women.
Children & Adolescents
Not recommended under 18 years
Kava should not be used by children and adolescents:
- •Development: Effects on brain development not studied
- •Metabolism: Children metabolize substances differently than adults
- •No studies: No clinical data for this age group
Relative Contraindications
In the following conditions, particular caution is advised. Use may be possible under certain circumstances but should only be done after careful consideration and ideally after consulting a physician.
Parkinson's Disease
Not recommended
Kava may worsen Parkinson's symptoms:
- •Dopamine antagonism: Kava may diminish dopaminergic effects
- •Levodopa interaction: May reduce the effectiveness of Levodopa
- •Case reports: Worsening of symptoms documented under Kava
Case report: Schelosky et al. (1995) reported on a 45-year-old woman with Parkinson's whose symptoms significantly worsened with Kava intake.
Severe Depression
Caution advised
Caution is warranted in cases of severe depression:
- •CNS depression: Kava may enhance lethargy
- •Medication interaction: Interactions with antidepressants possible
- •Self-medication: May delay professional treatment
Note: In cases of mild to moderate anxiety, Kava may be helpful, but in severe depression, professional treatment should take precedence.
Before Planned Surgeries
Discontinue 2 weeks prior
Kava should be discontinued before planned surgeries:
- •Anesthesia interaction: May enhance the effects of anesthetics
- •Bleeding risk: Possible interaction with anticoagulant medications
- •Liver function: Important for the metabolism of anesthetics
Recommendation: Discontinue Kava at least 2 weeks before a planned surgery and inform the anesthetist about prior use.
Driving & Operating Machinery
Impaired driving ability
Kava may impair reaction ability:
- •Sedation: Fatigue and slowed reactions possible
- •Dose-dependent: Higher doses impair more significantly
- •Individual differences: Sensitivity varies widely
Note: In contrast to benzodiazepines, studies show that Kava affects cognitive function less. Nevertheless, one should be aware of their individual reaction before driving.
Particular Caution
In certain groups of people, increased attention is required, even if there is no strict contraindication.
Genetic Factors (CYP2D6 Polymorphisms)
Increased sensitivity possible
About 5-10% of the European population are "Poor Metabolizers" for CYP2D6:
- •Slower metabolism: Kavalactones remain in the body longer
- •Higher blood levels: Enhanced effects and side effects
- •Recognition: Unusually strong reaction to normal doses
Recommendation: If you react unusually sensitively to Kava, a genetic factor may be involved. Start with lower doses.
Older Adults
Adjusted dosage recommended
Particular caution is advised in older adults:
- •Reduced liver function: Slower metabolism with age
- •Polypharmacy: Higher risk of interactions
- •Fall risk: Sedation may increase the risk of falls
Recommendation: Start with half the usual dose and gradually increase.
Decision Aid: Is Kava Suitable for Me?
Self-Check Before Kava Consumption
❌ Kava is NOT suitable if you:
- • Have or had a liver disease
- • Are pregnant or breastfeeding
- • Are under 18 years old
- • Drink alcohol regularly
- • Take benzodiazepines or antipsychotics
- • Take anticoagulants (blood thinners)
⚠️ Talk to your doctor if you:
- • Have Parkinson's disease
- • Suffer from severe depression
- • Take medications regularly
- • Have a surgery planned
- • Are over 65 years old
✓ Kava may be suitable if you:
- • Are healthy and have no liver problems
- • Do not take any of the medications listed above
- • Drink little or only occasionally
- • Are an adult (over 18 years)
- • Are not pregnant or breastfeeding
Warning Signs: When You Should Stop Immediately
Stop consumption immediately and consult a doctor if you experience:
- •Yellowing of skin or eyes (jaundice)
- •Dark urine (beer-colored)
- •Pale stool (discolored)
- •Unusual fatigue or weakness
- •Nausea or loss of appetite
- •Pain in the upper right abdomen
These symptoms may indicate liver problems and require immediate medical evaluation.
Continue in the Safety Chapter
Based on studies by
With contributions from
This wiki is a curated resource that synthesizes research from peer-reviewed studies and expert researchers. It is not written by the researchers listed above, but rather based on their published work.
Scientific Sources
The information on this page is based on the following scientific studies and publications:
In Vitro Toxicity of Kava Alkaloid, Pipermethystine, in HepG2 Cells Compared to Kavalactones
Nerurkar P.V., Dragull K., Tang C.S. (2004) – Toxicological Sciences
View studyContents
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