Experimental study of the effect of Caffeine on Pentazocine analgesia

Abstract

Objective: In this study the effect of caffeine on pentazocine analgesia in rats was assessed by “Tail-immersion test”. Methods: This study was performed by “Tail-immersion test”. Animals were juvenile M-Mari Rats (Male or female) weighing 120-160 gr. Findings: The average control latencies in “Tail-immersion test” were about 1.5-2 sec. The response latencies of rats which had been given caffeine (25, 50, 75 and 100 mg/kg I.P) or propyleneglycol (40%) were not significant comparing to those receiving an injection of the control vehicle over the 2 hours of testing period. Conclusion: The response latencies of pretreated parts with caffeine (100 mg/kg I.P) during 15, 30, 45 and 60 minutes after the injection of (10, 15, 20 and 25 mg/kg S.C) of pentazocine were significantly higher than those of control group. But injection of lower doses of caffeine and pentazocine did not show a significant analgesic effect compared with the control group.

Keywords

• analgesia
• pentazocine
• caffeine
• drug interaction