In the treatment of patients with recurrent severe colds, some doctors often use one antibiotic continuously, which will have two side effects: one is that it often destroys the balance of bacteria in the patient's body; the other is to make the patient develop drug resistance. Because bacteria that are not killed by antibiotics begin to become drug-resistant, and they may continue to reproduce.
According to the patient's condition, different kinds of antibiotics are used periodically is the most likely method to solve the above problem.