title: Primary hypoventilation.
mesh_terms: D000293:Adolescent; D003061:Codeine / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007040:Hypoventilation / Q000139:chemically induced*; D008297:Male; D008691:Methadone / Q000009:adverse effects*; D008875:Middle Aged
chemical_list: D008691:Methadone; D003061:Codeine