Antinociceptive Effect of Promethazine in Mice

Document Type : Original Article

Authors

1 School of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Iran

2 Young Researchers Club, Islamic Azad University, Kermanshah branch, Iran

3 School of Medicine, Hamedan University of Medical Sciences, Hamedan, Iran

Abstract

Objective(s)
The present study was undertaken to investigate the nociception activity of promethazine, a tranquillizer devoid of hypnotic activity in mice.
Materials and Methods
Antinociception was evaluated, using the acetic acid-induced writhing, tail flick, hot plate and formalin pain tests.
Results
Promethazine (4 and 6 mg/kg) and acetylsalicylic acid (100 mg/kg) produced a significant inhibition of the second phase response in the formalin pain model (P<0.05) and the drug couldn’t show an antinociceptive effect in the first phase. Morphine (10 mg/kg) inhibited both first and second phase response (P<0.01). Drug also showed a dose-dependent inhibition of acetic acid-induced abdominal writhes. The tail flick and hot plate latency weren’t different from control (P>0.05) and administration of naloxone (0.1 mg/kg) couldn't block the antinociceptive effect of promethazine.
Conclusion
The data obtained suggest that antinociceptive effects of the promethazine may be mediated via peripheral and not central mechanisms.

Keywords

References

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