The time it takes for azithromycin to work for bronchitis varies from person to person, and the drug can have a significant effect in a short time if it is right for the patient, but it may also take a long time to have an effect or no effect at all. 1. can be a short period of time to take effect of the situation: bronchitis if the bacteria or mycoplasma, chlamydia infection caused by, and is sensitive to azithromycin, the drug is generally a short period of time will be able to see the effect of treatment. 2. Longer time to take effect or ineffective situation: bronchitis if the infection is serious, sometimes it takes longer time to see the effect, usually in 72 hours after the drug for the assessment of the efficacy of the drug; if it is caused by viral infections, or drug-resistant bacterial infections, the use of azithromycin will not have any effect. 3. In addition, other causes such as physical and chemical stimuli or allergies can lead to the occurrence of bronchitis, which does not require antibiotic treatment, azithromycin will obviously be ineffective. Azithromycin may also cause gastrointestinal adverse reactions, liver damage or allergic reactions and other side effects. Therefore, patients with bronchitis need to consult a doctor in a timely manner, under the guidance of the doctor reasonable use of medication, do not recommend the use of azithromycin for treatment.