The fastest days to take azithromycin for bronchitis is related to the severity of the patient’s condition and sensitivity to the drug, and there are large individual differences. If a patient with bronchitis has a chronic cough, it is more likely to be a bacterial infection, and the patient may be treated with azithromycin for anti-infection. Usually, if the patient is sensitive to the drug, the effect can be seen in as early as 5-7 days. In more severe cases, oral medication is usually slower and can be given by intramuscular injection or intravenous drip, which usually works in as little as 3 days. However, if the symptoms are not effectively relieved after 7 days, it is recommended to go to the hospital respiratory medicine department in time to change other drugs under the guidance of the doctor, do not blindly choose antibiotics on their own. In addition, because azithromycin belongs to the macrolide class of drugs, its half-life is long, in the treatment of bronchitis can be used to eat 3 days to stop 4 days of medication, the specific usage and dose recommended to follow the doctor’s advice to take.