title: Opioid self-administration: a better way to evaluate analgesics in animal models?
authors.forename: J David
authors.initials: JD
authors.lastname: Clark
mesh_terms: D000701:Analgesics, Opioid / Q000008:administration & dosage*; D000818:Animals; D004195:Disease Models, Animal; D010146:Pain / Q000188:drug therapy*; D051381:Rats; D012646:Self Administration
chemical_list: D000701:Analgesics, Opioid