Phentolamine mesylate (OraVerse) is a drug used to reverse soft tissue anesthesia and the associated functional deficits resulting from a local dental anesthetic containing a vasoconstrictor. Which statement best describes its mechansim of action?

• Correct answer

  Causes vasodilation and increased blood flow in iniection area

• Prevents the influx of sodium into the neuron by blocking neuronal channels

• Prevents the efflux of sodium out of the neuron

• Causes vasoconstriction and decreased blood flow in injection area