Abstract
Background/Aims: Post-operative nausea and vomiting are common adverse events that require administration of anti-emetic compounds, such as the serotonin 5-HT<sub>3</sub> receptor antagonists, but these drugs can also reduce the analgesic efficacy of some analgesics (paracetamol, tramadol). Methods: The present study was designed to explore the effect of 3 serotonin 5-HT<sub>3</sub> receptor antagonists on the antinociceptive efficacy of another frequently used post-operative analgesic, nefopam, in the mouse writhing and formalin tests. Results: Pre-treatment with tropisetron, ondansetron or MDL72222 did not significantly modify nefopam antinociception in both tests. However, paracetamol antinociception was blocked by ondansetron in the formalin test. Conclusion: These results provide a rationale for the clinical use of nefopam with anti-emetics during surgery.
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