Azithromycin belongs to the macrolide antibiotics, hanging time, depending on different patients, different infectious diseases and different courses, the total course of treatment is usually about 7 to 10 days, if you need to switch to oral, at least 2 days before switching to oral drugs. If the condition is mild, a course of injections can be used for 3 to 5 days, and then the condition can be evaluated. If the condition is largely resolved, azithromycin can be discontinued at this time. Azithromycin on the gastrointestinal tract of the irritability of the patient may appear after the use of drugs gastrointestinal discomfort symptoms, such as nausea, vomiting, etc., so mild patients with basic healing of the disease can be discontinued; if the condition is slightly serious, patients in the use of drugs after 5 days can be extended according to the specific circumstances of 1 to 2 days, which is in order to play a better therapeutic effect. Before the disease is cured, stopping the medication at will may lead to recurrence of the disease, which may easily cause drug resistance, which is not conducive to the treatment of the disease. However, when extending the use of drugs for 1 to 2 days, you can change the method of medication, for example, you can change to oral medication. If the condition is serious, the drug should be used continuously according to the course of treatment, and at the same time closely observe the changes in the condition, and the liver and kidney functions need to be rechecked when the drug is used for about 7 days, to make clear whether the prolonged use of azithromycin has any effect on the liver and kidney functions. The medication should be used under the guidance of a doctor.