title: The narcotic equivalency index.
authors.forename: R G
authors.initials: RG
authors.lastname: Twycross
mesh_terms: D000284:Administration, Oral; D006801:Humans; D007273:Injections, Intramuscular; D009020:Morphine / Q000008:administration & dosage*; D009369:Neoplasms / Q000503:physiopathology*; D010146:Pain / Q000517:prevention & control*
chemical_list: D009020:Morphine