The effect of morphine on regional cerebral glucose metabolism was measured in rats using high resolution [14C]2-deoxyglucose autoradiography with concurrent confirmation of morphine-induced analgesia measured by tail-flick latency to noxious heat. Within the limits of resolution of this technique, doses of morphine sufficient to inhibit the tail-flick reflex had no significant effect on glucos...

herbal medicine has an old history with a broad application all over the world. many researches have focused on the curative as well as antinociceptive effects of herbal extract. the aim of this study was to investigate the analgesic effects of berberis vulgaris hydroethanolic extract (bve) in male mice. 30 male mice were divided into 5 groups: control, treated by morphine, treated by bve (150 ...

We reported previously that nitrous oxide induces pre-emptive analgesia that is partially antagonized by naloxone and totally antagonized by halothane. The aims of this study were to determine if halothane and isoflurane are similar in this respect and to examine if volatile anaesthetics antagonize the analgesic effect of exogenous opioids. We found that 75% nitrous oxide prolonged tail-flick l...

extracts obtained from the petals of rosa damascena (rosaceae) are used in iranian folk medicine as remedies for the treatment of some inflammatory diseases. in this study the hydroalcoholic extract and essential oil of the plant were investigated for its possible anti-inflammatory and analgesic activities. the extract was administered at the doses (p.o.) of 250, 500 and 1000?mg/kg and the dose...

introduction: methadone has been used as a drug to detoxify opioid tolerance. naloxane precipitated morphine withdrawal behaviours were attenuated by venlafaxine as an antidepressant. on the contrary, after detoxifying the opioids, spontaneous withdrawal syndrome may occur with pain sensitivity. therefore the present study aimed to examine the effects of chronic methadone (70 mg/kg, in drinking...

Since use of antinoceceptive chemical drugs for relief of pain has many side effects, medical plants seem very noticeable today. Previous findings indicate that Carum Carvi (CC) modulates pain in both animal and human. The present work investigated the effects of hydoalcoholic extract of CC on acute pain in Hot plate and Tail flick models. Albino mice (20-30 g) were used for this study. Hydroal...

This study characterizes the anesthetic profile of dexmedetomidine on the basis of steady-state plasma concentrations using defined stimulus-response, ventilatory, and continuous electroencephalographic (EEG) and cardiovascular effect measures in rats. At constant plasma concentrations of dexmedetomidine (range, 0.5-19 ng/ml), targeted and maintained by target-controlled infusion, the whisker r...

Recent neuroanatomical and behavioral evidence has indicated that vasopressin (VA) increases pain threshold. The dorsal raphe nucleus (DRN) is an important nucleus in pain modulation. Anatomical studies have shown that DRN receives vasopressinergic fibers originating in the hypothalamic paraventricular nucleus. The aim of the present study was to examine the effects of intra-DRN injection of de...