title: Absence of cross-tolerance and the situational specificity of tolerance.
authors.forename: S
authors.initials: S
authors.lastname: Siegel
authors.forename: J A
authors.initials: JA
authors.lastname: Kim
mesh_terms: D000279:Administration, Cutaneous; D000701:Analgesics, Opioid / Q000008:administration & dosage / Q000494:pharmacology*; D004361:Drug Tolerance / Q000502:physiology*; D005283:Fentanyl / Q000494:pharmacology*; D006801:Humans; D009020:Morphine / Q000494:pharmacology*
chemical_list: D000701:Analgesics, Opioid; D009020:Morphine; D005283:Fentanyl