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Kava Side Effects & Safety

Evidence:Strong
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Safe with Caution

Potential Side Effects

  • GI discomfort (most common side effect)
  • Headache (uncommon)
  • Dizziness (uncommon)
  • Drowsiness (dose-dependent)
  • Skin rash or "kava dermopathy" with chronic heavy use (reversible scaly skin)
  • Liver injury — rare but serious; linked primarily to non-noble cultivars, aerial plant parts, and acetone/ethanol extraction. Noble root water extracts have an excellent safety record in Pacific Island populations

Drug & Supplement Interactions

  • Hepatotoxic medications (acetaminophen, statins) — avoid combining due to theoretical additive liver stress
  • Alcohol — AVOID combining kava with alcohol (additive hepatotoxicity risk and CNS depression)
  • Benzodiazepines and sedatives — additive CNS depression, avoid combination
  • CYP1A2, CYP2C9, CYP2C19, CYP3A4 substrates — kavalactones inhibit multiple CYP enzymes
  • Levodopa / antiparkinson drugs — kava may reduce dopamine signaling, worsening Parkinson symptoms
  • MAO inhibitors — theoretical interaction due to kava's MAO-B effects

Maximum Dose

Do not exceed: 300mg kavalactones/day (German Commission E recommendation). Limit use to 3 months without medical supervision.

Full Kava Guide

References

  1. Meta-analysisPittler MH, Ernst E (2003). Kava extract for treating anxiety. Cochrane Database of Systematic Reviews. DOI PubMed
  2. RCTSarris J, Stough C, Bousman CA, et al. (2013). Kava in the treatment of generalized anxiety disorder: a double-blind, randomized, placebo-controlled study. Journal of Clinical Psychopharmacology. DOI PubMed
  3. ReviewTeschke R, Sarris J, Lebot V (2012). Kava hepatotoxicity solution: a six-point plan for new kava standardization. Phytomedicine. DOI PubMed
  4. Sarris J, LaPorte E, Schweitzer I (2011). Kava: a comprehensive review of efficacy, safety, and psychopharmacology. Australian and New Zealand Journal of Psychiatry. DOI PubMed
  5. ReviewOoi SL, Henderson P, Pak SC (2018). Kava for Generalized Anxiety Disorder: A Review of Current Evidence.. Journal of alternative and complementary medicine (New York, N.Y.). DOI PubMed
  6. Meta-analysisWitte S, Loew D, Gaus W (2005). Meta-analysis of the efficacy of the acetonic kava-kava extract WS1490 in patients with non-psychotic anxiety disorders.. Phytotherapy research : PTR. DOI PubMed
  7. Stevinson C, Huntley A, Ernst E (2002). A systematic review of the safety of kava extract in the treatment of anxiety.. Drug safety. DOI PubMed
Show 5 more references
  1. Ernst E (2002). The risk-benefit profile of commonly used herbal therapies: Ginkgo, St. John's Wort, Ginseng, Echinacea, Saw Palmetto, and Kava.. Annals of internal medicine. DOI PubMed
  2. Abadi S, Papoushek C, Evans MF (2001). Is kava extract effective for treating anxiety?. Canadian family physician Medecin de famille canadien. PubMed
  3. Pittler MH, Ernst E (2000). Efficacy of kava extract for treating anxiety: systematic review and meta-analysis.. Journal of clinical psychopharmacology. DOI PubMed
  4. Economidis G, Lynch M, Taylor S, Asare-Doku W, et al. (2025). Global Perspectives on Kava: A Narrative Systematic Review of the Health Effects, Economic and Social Impacts and Policy Considerations.. Drug and alcohol review. DOI PubMed
  5. Cassidy RM, Burdick K, Anesi T, Daunis D (2024). Kava Withdrawal Treated With Phenobarbital-A Case Report and Literature Review.. Journal of addiction medicine. DOI PubMed