title: XV. A critique of the "dual action" hypothesis of morphine physical dependence.
mesh_terms: D006801:Humans; D007977:Levallorphan / Q000008:administration & dosage; D009020:Morphine / Q000037:antagonists & inhibitors; D009021:Morphine Dependence; D013268:Stimulation, Chemical; D013375:Substance Withdrawal Syndrome
chemical_list: D007977:Levallorphan; D009020:Morphine