Superdosagem de paracetamol em adultos

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Last reviewed: 15 Aug 2025
Last updated: 03 Oct 2023

Summary

Definition

History and exam

Other diagnostic factors

  • náuseas e vômitos
  • fatores de risco
  • dor subcostal direita
  • icterícia
  • hepatomegalia
  • nível de consciência alterado
  • asterixis (flapping)
  • dor lombar ou nos flancos
Full details

Risk factors

  • história de autolesão
  • história de uso frequente ou repetido de medicamentos para alívio de dor
  • deficiência de glutationa
  • drogas que induzem enzimas hepáticas (indutores do citocromo P450)
  • peso corporal baixo (<50 kg)
Full details

Diagnostic investigations

1st investigations to order

  • concentração sérica de paracetamol
  • testes da função hepática
  • tempo de protrombina (TP) e razão normalizada internacional (INR)
  • glicose sanguínea
  • ureia, creatinina e eletrólitos
  • gasometria arterial ou venosa
  • hemograma completo
Full details

Investigations to consider

  • nível de salicilato
  • urinálise
  • exame de urina para detecção de drogas
Full details

Treatment algorithm

ACUTE

superdosagem aguda única

superdosagem escalonada

excesso terapêutico

Contributors

Expert advisers

Alexander Alexiou, MB, BS, BSc, DCH, FRCEM, DipIMC RCSEd

Consultant in Emergency Medicine

Royal London Hospital

Consultant in Physician Response Unit

Barts Health NHS Trust/London Air Ambulance

London

UK

Disclosures

AA declares that he has no competing interests.

Acknowledgements

BMJ Best Practice would like to gratefully acknowledge the previous team of expert contributors, whose work has been retained in parts of the content:

Johann Grundlingh MBChB, FCEM, FFICM, EDICM, DFMS, DipMedTox, MMedTox, MSB, ERT, MEWI, MBA

Emergency Medicine Consultant

Royal London Hospital

Barts Health NHS Trust

Honorary senior lecturer

Queen Mary University

London

UK

Clarissa Ribeiro

Senior Clinical Fellow

Newham University Hospital

Barts Health NHS Trust

London

UK

Daniel K. Colby MD

Assistant Professor

Department of Emergency Medicine

UC Davis Health

CA

Alastair Newton MB ChB, FCEM

Consultant in Emergency Medicine

The Prince Charles Hospital

Brisbane

Australia

Disclosures

JG, CR, DKC and AN declare that they have no competing interests.

Peer reviewers

Ruben Thanacoody, MD, FRCP (Edin)

Consultant Physician and Clinical Toxicologist

Regional Drugs and Therapeutics Centre

Newcastle upon Tyne

UK

Disclosures

RT was an investigator in the Scottish and Newcastle Antiemetic Pre-treatment for paracetamol poisoning (SNAP) study. RT declares that he has no other competing interests.

Peer reviewer acknowledgements

BMJ Best Practice topics are updated on a rolling basis in line with developments in evidence and guidance. The peer reviewers listed here have reviewed the content at least once during the history of the topic.

Disclosures

Peer reviewer affiliations and disclosures pertain to the time of the review.

References

Our in-house evidence and editorial teams collaborate with international expert contributors and peer reviewers to ensure that we provide access to the most clinically relevant information possible.

Key articles

National Poisons Information Service. TOXBASE. Paracetamol. 2023 [internet publication].Full text

National Institute for Health and Care Excellence. Self-harm: assessment, management and preventing recurrence. Sep 2022 [internet publication].Full text

Royal College of Emergency Medicine. RCEM position statement. Use of the SNAP regime for the treatment of paracetamol toxicity. Nov 2021 [internet publication].Full text

Reference articles

A full list of sources referenced in this topic is available to users with access to all of BMJ Best Practice.
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