Meperidine-induced delirium

Area of Science:

• Pharmacology
• Toxicology
• Neuroscience

Background:

• Meperidine is a commonly used opioid analgesic.
• Its potential to induce delirium is often underestimated.
• Behavioral toxicity associated with meperidine requires further investigation.

Observation:

• Six cases of meperidine-induced behavioral toxicity were documented.
• Toxicity risk increased when meperidine was co-administered with cimetidine or anticholinergic drugs.
• Symptoms included delirium and other behavioral changes.

Findings:

• The excessive anticholinergic activity of meperidine or its metabolite, normeperidine, is implicated in causing delirium.
• Discontinuation of meperidine and substitution with morphine were effective treatments.
• Physostigmine demonstrated efficacy in reversing delirium in one case.

Implications:

• Clinicians should be aware of the risk of meperidine-induced delirium.
• Careful consideration of drug interactions, particularly with anticholinergic agents, is crucial.
• Alternative analgesics like morphine may be preferred in certain patient populations to mitigate delirium risk.