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Kava
Kava — o que a monografia europeia realmente apoia, para que não é, a forma e por quanto tempo deve ser usado, efeitos colaterais e a 3 interação medicamentosas documentada.
Esta é uma página de referência, não um diagnóstico nem uma receita. Produtos herbais são farmacologia de verdade: têm efeitos, efeitos colaterais e interações. Conte ao médico e ao farmacêutico tudo o que toma, incluindo chás e suplementos, e nunca pare ou mude um medicamento prescrito por causa do que ler aqui.
O que é
Piper methysticum G.Forst. — root and rhizome
Agrupado aqui em Where the harm is. Posição regulatória:Withdrawn, suspended or restricted as a medicine in much of Europe after reports of severe liver injury.
O que a evidência apoia
A indicação registrada:It was marketed for anxiety. It is included here as a boundary, not a recommendation.
Kava beverages have a long cultural history in the Pacific islands. The European story is different: standardised kava extracts marketed for anxiety in the 1990s were withdrawn or suspended in several countries after reports of severe hepatotoxicity, including liver failure requiring transplantation. Regulatory positions have shifted back and forth in the decades since and availability differs by country, which is exactly why an internet order is a poor way to settle the question. The awkward part of the case is that the trials suggested a genuine anxiety-reducing effect — an effective product with a rare, catastrophic harm is a much harder judgement than an ineffective one, and that is the honest shape of the kava file rather than a simple story of quackery. Preparation matters too: traditional water-based preparations of the peeled rootstock differ from the acetone and ethanol extracts that reached European shelves.
D — Popular claim unsupported, or safety dominates The better trials are negative, or the substance appears in the literature mainly for the harm it has caused.
Para que não é
Anxiety disorders, which have treatments with far better-characterised risk. Do not import it to self-treat.
Forma, força e por quanto tempo
Traditional water-based root beverages; ethanol and acetone extracts in capsules, which are the preparations associated with the liver reports.
Duração.Not applicable — no European regulator is recommending a course.
Nenhum número em gramas aparece nesta página de propósito. A parte da planta, o solvente de extração e a razão droga-extrato juntos definem uma preparação, e um número tirado de uma não descreve outra. O raciocínio está no hub; a quantidade que se aplica a você é a impressa na embalagem que segura, e um farmacêutico lê com você.
Efeitos colaterais
Liver injury, which is rare but has been severe and occasionally fatal. Regular heavy use causes a dry, scaly skin condition known as kava dermopathy. Drowsiness and impaired driving, markedly worsened by alcohol.
Quem deve evitar
Avoid entirely with any liver disease, in pregnancy and while breastfeeding, and before driving.
Interações com medicamentos
| Medicamento ou substância | O que é descrito |
|---|---|
| Alcohol | The combination increases both sedation and the liver risk, and impaired driving with kava plus alcohol is documented. |
| Sleeping tablets, benzodiazepines and sedating antihistamines | Additive sedation with benzodiazepines, sleeping tablets and sedating antihistamines. |
| Anything else that stresses the liver | Anything else with a liver signal — including alcohol and several medicines — should not be stacked with it. |
A visão inversa — começar pelo medicamento em vez da planta — está na referência de interações de medicamentos, alimentos e álcool, e resumido para cada erva neste site.
Fontes:NIH National Center for Complementary and Integrative Health — herb fact sheets · LiverTox: Clinical and Research Information on Drug-Induced Liver Injury (NIDDK, National Institutes of Health)· verificado2026-09-06
Perguntas frequentes
Para que kava é usado?
It was marketed for anxiety. It is included here as a boundary, not a recommendation. Kava beverages have a long cultural history in the Pacific islands. The European story is different: standardised kava extracts marketed for anxiety in the 1990s were withdrawn or suspended in several countries after reports of severe hepatotoxicity, including liver failure requiring transplantation. Regulatory positions have shifted back and forth in the decades since and availability differs by country, which is exactly why an internet order is a poor way to settle the question. The awkward part of the case is that the trials suggested a genuine anxiety-reducing effect — an effective product with a rare, catastrophic harm is a much harder judgement than an ineffective one, and that is the honest shape of the kava file rather than a simple story of quackery. Preparation matters too: traditional water-based preparations of the peeled rootstock differ from the acetone and ethanol extracts that reached European shelves.
kava funciona?
Classificado aqui D: The better trials are negative, or the substance appears in the literature mainly for the harm it has caused. Anxiety disorders, which have treatments with far better-characterised risk. Do not import it to self-treat.
Quanto kava devo tomar?
Esta referência não imprime números em gramas, porque não se transferem entre preparações de força de extrato diferente. O que se pode dizer com honestidade é a forma e a duração:Traditional water-based root beverages; ethanol and acetone extracts in capsules, which are the preparations associated with the liver reports. Not applicable — no European regulator is recommending a course.
Quais os efeitos colaterais de kava?
Liver injury, which is rare but has been severe and occasionally fatal. Regular heavy use causes a dry, scaly skin condition known as kava dermopathy. Drowsiness and impaired driving, markedly worsened by alcohol.
kava interage com medicamentos?
Sim — documentado paraAlcohol, Sedatives, Liver load. Cada uma é descrita nesta página, com um link para a referência do lado medicamento onde existir.
Outros emwhere the harm is
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