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Tolerability of paracetamol.
Garry G Graham1, Kieran F Scott, Richard O Day
1Department of Clinical Pharmacology, St Vincent's Hospital, School of Medical Sciences, Sydney, Australia. ggraham@stvincents.com.au
Drug Safety
|March 1, 2005
Summary
Paracetamol (acetaminophen) is generally well-tolerated at therapeutic doses, with overdose being the primary cause of liver damage. Alcohol consumption does not significantly increase the risk of paracetamol-induced hepatotoxicity.
Area of Science:
- Pharmacology
- Hepatology
- Gastroenterology
Background:
- Paracetamol (acetaminophen) is widely used due to its excellent tolerability at therapeutic doses.
- Overdose is the main cause of paracetamol-induced hepatotoxicity.
- Concerns exist regarding toxicity at therapeutic doses and interactions with alcohol, gastrointestinal issues, and chronic diseases.
Purpose of the Study:
- To critically evaluate the safety profile of paracetamol (acetaminophen) at therapeutic doses.
- To assess the risk of hepatotoxicity, gastrointestinal toxicity, and other adverse effects.
- To clarify the association between paracetamol use and specific patient populations, including pregnant women and alcohol consumers.
Main Methods:
- Critical analysis of existing literature, including prospective studies and controlled clinical trials.
- Review of case-control studies investigating gastrointestinal toxicity, chronic renal disease, and asthma.
- Evaluation of data on hypersensitivity reactions and use during pregnancy.
Main Results:
- Therapeutic doses of paracetamol are unlikely to cause hepatotoxicity, even with moderate to heavy alcohol intake.
- Paracetamol is well-tolerated by the gastrointestinal tract; associations with GI toxicity may be due to study biases.
- Apparent links to chronic renal disease and asthma are likely biased due to paracetamol's perceived safety.
- Hypersensitivity reactions are rare; safety in pregnancy requires further prospective studies.
Conclusions:
- Paracetamol (acetaminophen) demonstrates excellent tolerability at therapeutic doses, with overdose being the primary risk factor for hepatotoxicity.
- The drug is safe for the gastrointestinal tract, and associations with other conditions are likely due to confounding factors.
- Further research is needed to confirm safety during pregnancy.