title: Demethylchlortetracycline, lymecycline and methacycline compared in patients with purulent exacerbations of bronchitis.
mesh_terms: D000368:Aged; D001991:Bronchitis / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D003707:Demeclocycline / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008194:Lymecycline / Q000627:therapeutic use; D008297:Male; D008690:Methacycline / Q000627:therapeutic use*; D008875:Middle Aged; D013752:Tetracycline / Q000627:therapeutic use*
chemical_list: D003707:Demeclocycline; D008194:Lymecycline; D013752:Tetracycline; D008690:Methacycline