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Cimetidine as adjunctive treatment for acetaminophen overdose
K K Burkhart1, N Janco, K W Kulig
1Rocky Mountain Poison and Drug Center, Denver General Hospital, University of Colorado Health Sciences Center 80204, USA.
Human & Experimental Toxicology
|March 1, 1995
Summary
Cimetidine did not offer additional liver protection when given with N-acetylcysteine for acetaminophen poisoning after 8 hours. This study found no significant difference in liver enzyme levels between treated and control groups.
Area of Science:
- Toxicology
- Pharmacology
- Hepatology
Background:
- Acute acetaminophen poisoning can lead to severe liver damage.
- N-acetylcysteine is the standard treatment, but its efficacy may be reduced when initiated late.
- Investigating adjunctive therapies like cimetidine is crucial for improving outcomes.
Purpose of the Study:
- To evaluate the additional hepatoprotective effect of cimetidine combined with N-acetylcysteine in acute acetaminophen poisoning.
- To assess if cimetidine improves liver function when treatment starts more than 8 hours post-ingestion.
Main Methods:
- Prospective study at a poison control center over 2 years.
- Patients with acetaminophen overdose received standard care and N-acetylcysteine.
- Odd months: cimetidine added; even months: placebo (control group).
- Serum AST levels were monitored to assess liver injury.
Main Results:
- No statistically significant difference in peak AST levels between cimetidine and control groups.
- Similar rates of severe liver injury (AST > 1000 IU/L) in both groups (21% vs. 20%).
- Cimetidine did not alter liver enzyme profiles compared to standard N-acetylcysteine treatment.
Conclusions:
- Cimetidine, when added to N-acetylcysteine therapy initiated later than 8 hours post-acetaminophen overdose, does not provide additional hepatoprotection.
- Current evidence does not support the routine use of cimetidine in this specific clinical scenario.