Roxithromycin is usually taken for more than 7 days before resistance develops. Roxithromycin is an antibiotic belonging to the class of macrolides, which are broad-spectrum antibiotics. It is mainly used for the treatment of pathogenic infectious diseases such as urinary tract infections and pelvic inflammatory diseases such as Staphylococcus aureus, gram-positive bacteria, anaerobes, chlamydia and mycoplasma. Roxithromycin is used for treatment for about 7 days and has a good inhibitory effect on the disease. If it is taken frequently or for more than 7 days, it may lead to the emergence of bacterial resistance, thus causing a decrease in the efficacy of the drug. Roxithromycin is generally eaten more than 7 days will produce drug resistance, such as the need to use roxithromycin should be used under the guidance of a doctor, do not use the drug on your own, so as not to cause adverse reactions and physical discomfort.