Prophylactic use of oxytetracycline for exacerbations of chronic bronchitis.
D001991:Bronchitis / Q000628:therapy*; D029481:Bronchitis, Chronic; D006801:Humans; D010118:Oxytetracycline / Q000627:therapeutic use*; D021841:Safe Sex
D010118:Oxytetracycline
BRONCHITIS/therapy; OXYTETRACYCLINE/therapeutic use