Reexpression of morphine-induced oral stereotypy six months after last morphine sensitizing dose.

We describe three experiments, two of which were designed to determine the duration of the sensitization to morphine-induced oral stereotypy caused by three high doses of morphine (MS) administered 12 h apart (10, 20, and 20 mg/kg). In one of these experiments, we also administered an additional 40 mg/kg. The third experiment was designed to determine the… CONTINUE READING