Aim:The goal of this study was to investigate the effects of morphine, midazolam and midazolammorphine on nociception. Benzodiazepines are known to influence opioid analgesia, and variations can be expected in the interaction between benzodiazepines and opioids at different times of the day.
Method:The effects of midazolam, morphine, and midazolam-morphine combination on nociception were evaluated with tail flick test in mice, with together the time-dependent changes. Midazolam has not any antinociceptive effect and it inhibited in a fashion dose-dependent the antinociceptive effect of morphine.