Sodium Ions Modulate Differentially the Effect of a Benzodiazepine Agonist on Rat Spinal µ-, δ- and ĸ-Opioid Receptors

Midazolam, a benzodiazepine receptor agonist, when injected intrathecally either enhances or decreases antinociception produced by intrathecal administration of morphine in rats. Furthermore, midazola