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What laboratory studies, small human studies and case reports actually show about kava interactions.

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Kava can interact with medicines and other central nervous system depressants. Laboratory findings show several possible CYP inhibitions, but small human studies do not confirm one uniform pattern across all enzymes. Alcohol and sedatives in particular should not be self-combined; regular medication warrants individual review.

System cytochromu P450

System cytochromu P450 (CYP450) to rodzina enzymów w wątrobie, które są odpowiedzialne za metabolizm większości leków. Gdy substancja hamuje te enzymy, inne substancje są metabolizowane wolniej – ich działanie i skutki uboczne mogą się w ten sposób nasilać.

Dlaczego to ważne?

Many medicines are metabolised by CYP enzymes. An in-vitro finding does not automatically mean clinically relevant inhibition in humans. Preparation, dose, duration and the medicine's therapeutic window determine practical relevance.

Jakie enzymy są hamowane?

Mathews et al. (2002) tested kava extract and individual kavalactones in human liver microsomes and found inhibition of several CYP enzymes. These are in-vitro findings, not clinical inhibition ratings in humans:

EnzymSiła hamowaniaWażne substraty (przykłady)
CYP1A2In-vitro findingKofeina, teofilina, klozapina, olanzapina
CYP2C9In-vitro findingWarfarin, fenytoina, NLPZ (ibuprofen)
CYP2C19In-vitro findingOmeprazol, diazepam, klopidogrel
CYP2D6In-vitro findingKodeina, tramadol, wiele leków przeciwdepresyjnych
CYP3A4In-vitro findingBenzodiazepiny, statyny, wiele antybiotyków

Znaczenie kliniczne

Russmann et al. (2005) reported reduced CYP1A2 activity in chronic users of traditional aqueous kava. Gurley et al. (2005; 12 healthy volunteers, 28 days, 138 mg kavalactones/day), by contrast, found reduced CYP2E1 but no significant change in CYP1A2, CYP2D6 or CYP3A4/5. The human findings are small and preparation- and consumption-dependent, so they cannot predict every medicine interaction.

Kombinacje wysokiego ryzyka

The following combinations should be avoided or medically reviewed in advance. Reasons differ: some involve additive CNS effects or case reports, while others have only mechanistic signals and no controlled combination trials.

⚠ Alkohol

Risiko: AVOID

Concurrent use of kava and alcohol is not recommended:

  • 1.Additive CNS effects: Drowsiness, slower reactions and impaired coordination may increase.
  • 2.Liver risk not quantified: A combined liver risk has not been quantified reliably; the combination is avoided because of this uncertainty.
  • 3.Unpredictable intensity: Product, amount, drinking pattern and individual sensitivity make effects difficult to predict.

Do not use kava and alcohol together. The main practical reason is possible additive impairment of attention, reaction and coordination; the size of any additional liver risk is not reliably established.

⚠ Benzodiazepiny i leki nasenne

Risiko: PROFESSIONAL REVIEW

Do not combine benzodiazepines or Z-drugs with kava without medical review:

  • •Additive sedation: Drowsiness and psychomotor impairment may increase.
  • •CNS depression: Clinically relevant potentiation is possible; controlled combination trials are lacking.
  • •Interpret CYP findings: CYP3A4 inhibition was observed in vitro but not consistently confirmed in small human studies.

Raport przypadku: Almeida & Grimsley (1996) described a semicomatose state in a 54-year-old man after reported kava and alprazolam use. A single case report is a warning signal but does not establish mechanism or frequency.

⚠ Leki przeciwpsychotyczne

Risiko: PROFESSIONAL REVIEW

Individual medical review is appropriate before kava use with antipsychotics:

  • •Sedation: Additive drowsiness or psychomotor impairment is possible.
  • •Case reports: Individual reports describe movement disorders; frequency and causality are unclear.
  • •CYP findings: Laboratory inhibition does not reliably predict the level of a specific medicine.

⚠ Leki przeciwzakrzepowe (rozrzedzające krew)

Risiko: PROFESSIONAL REVIEW

Warfarin, phenprocoumon and other anticoagulants require professional review because of their narrow therapeutic window:

  • •Mechanistic signal: CYP2C9 inhibition was observed in vitro; a clinical kava-warfarin interaction has not been established in controlled studies.
  • •Monitor INR: Changes in co-used products should be coordinated with the treating clinician.
  • •Bleeding risk: The baseline risk of anticoagulation makes self-testing inappropriate.

Use kava with anticoagulation only after individual medical review.

Kombinacje o umiarkowanym ryzyku

Następujące kombinacje wymagają ostrożności i powinny być stosowane tylko po konsultacji z lekarzem. Może być konieczna zmiana dawki.

Leki przeciwdepresyjne

Risiko: PROFESSIONAL REVIEW

SSRI (fluoksetyna, sertralina, paroksetyna itp.):
  • • Pharmacokinetic interactions may occur depending on the product but are not clinically established as a class
  • • Serotonin syndrome from kava is not established as a typical clinical effect
  • • Additive drowsiness or dizziness are possible
SNRI (wenlafaksyna, duloksetyna):
  • • Direct clinical combination data are limited
  • • Review co-medication individually rather than inferring from in-vitro CYP data
Inhibitory MAO:
  • • MAO-B effects of individual kavalactones have been studied preclinically
  • • Pawa et al. (2026) found MAO-A inhibition by flavokawain A in an in-vitro enzyme assay; humans and combination with MAO inhibitors were not studied
  • • Do not self-combine with MAO inhibitors because medicine interactions can be serious
  • • Obtain medical review before use

Leki przeciwdrgawkowe (lek przeciwpadaczkowy)

Risiko: PROFESSIONAL REVIEW

Fenytoina, karbamazepina, walproinian i inne leki przeciwdrgawkowe:

  • •Pharmacokinetics: Altered levels are possible but cannot be predicted reliably for individual combinations.
  • •CNS effects: Additive drowsiness or coordination problems are possible.
  • •Seizure control: Changes in co-used products belong under professional supervision.

W przypadku padaczki Kava powinna być stosowana tylko pod nadzorem lekarza.

Leki na Parkinsona

Risiko: PROFESSIONAL REVIEW

Levodopa i agoniści dopaminy:

  • •Mechanism unclear: Blanket clinical dopamine antagonism by kava has not been established.
  • •Case reports: Individual reports describe worsening Parkinson symptoms; medical review is therefore needed.

With Parkinson's disease or related medication, use kava only after medical review.

Leki hepatotoksyczne

Risiko: UMIARKOWANE

Leki o znanym potencjale hepatotoksycznym:

  • •Paracetamol/acetaminofen: Szczególnie problematyczne przy wyższych dawkach
  • •Statyny: Atorwastatyna, simwastatyna itp. (substraty CYP3A4)
  • •Metotreksat: Immunosupresant z hepatotoksycznością
  • •Izoniazyd: Lek na gruźlicę

Additional liver risk is plausible but not quantified for every combination. Potentially hepatotoxic medication requires individual medical review.

Tabela przeglądowa interakcji

Klasa substancjiPrzykładyRyzykoMechanizm
AlkoholEthanolAVOIDPossible additive sedation and impaired coordination; liver risk not quantified
BenzodiazepinyDiazepam, lorazepam, alprazolamPROFESSIONAL REVIEWPossible additive CNS depression; one case report, no controlled combination trials
Leki przeciwpsychotyczneHaloperidol, olanzapina, klozapinaPROFESSIONAL REVIEWSedation or interactions possible; direct clinical data limited
Leki przeciwzakrzepoweWarfarin, fenprokumonPROFESSIONAL REVIEWNo controlled kava interaction established; narrow therapeutic window
SSRIFluoksetyna, sertralina, paroksetynaPROFESSIONAL REVIEWPossible sedation or pharmacokinetics; no established kava serotonin syndrome
Leki przeciwdrgawkoweFenytoina, karbamazepinaPROFESSIONAL REVIEWPossible additive CNS effects and unpredictable pharmacokinetics
Leki na ParkinsonaLevodopa, agoniści dopaminyPROFESSIONAL REVIEWCase reports of symptom worsening; no blanket dopamine antagonism established
StatynyAtorwastatyna, simwastatynaPROFESSIONAL REVIEWDirect clinical interaction data are lacking; review liver and medication context
OpioidyKodeina, tramadol, morfinaAVOID / REVIEWPossible additive CNS depression
KofeinaKawa, napoje energetyczneCAUTIONHuman CYP1A2 findings are small and inconsistent

Praktyczne zalecenia

Lista kontrolna przed spożyciem Kavy

  • 1.
    Sprawdź listę leków

    Sprawdź wszystkie aktualne leki pod kątem interakcji

  • 2.
    Skonsultuj się z lekarzem

    W przypadku regularnego przyjmowania leków przed spożyciem Kavy skonsultuj się z lekarzem

  • 3.
    Unikaj alkoholu

    Do not use kava and alcohol together. The main practical reason is possible additive impairment of attention, reaction and coordination; the size of any additional liver risk is not reliably established.

  • 4.
    Niska dawka

    Do not experiment with a self-selected lower kava dose while taking medicines; obtain professional review of the combination.

  • 5.
    Obserwuj objawy

    Zwróć uwagę na nietypowe zmęczenie, zawroty głowy lub inne objawy

Kontynuuj w rozdziale Bezpieczeństwo

Na podstawie badań

Christopher McCurdy

University of Florida College of Pharmacy

Zobacz profil →

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To wiki jest zasobem kuratorskim, który syntetyzuje badania z recenzowanych artykułów i badaczy ekspertów. Nie zostało napisane przez badaczy wymienionych powyżej, ale raczej opiera się na ich opublikowanych pracach.

Źródła naukowe

Informacje na tej stronie opierają się na następujących badaniach i publikacjach naukowych:

Cytochrome P450 2E1 (CYP2E1) Is the Principal Enzyme Responsible for Urethane Metabolism

Hoffler U., El-Masri H.A., Ghanayem B.I. (2003) – Journal of Pharmacology and Experimental Therapeutics

Zobacz badanie

Kava: From Ethnology to Pharmacology

Yadhu N. Singh (Editor) (2004) – CRC Press

Zobacz badanie
Last updated: 18 marca 2026•New study added